ICSE 10th Chemistry Sample Paper 01 Page 1

Sample Paper 01
ICSE Class X 2024-25
Chemistry
Science Paper - 2
Time: 2 Hours Max. Marks: 80
General Instructions:
1. Answer to this Paper must be written on the paper provided separately.
2. You will not be allowed to write during first 15 minutes.
3. This time is to be spent in reading the question paper.
4. The time given at the head of this Paper is the time allowed for writing the answers.
5. Section A is compulsory. Attempt any four questions from Section B.

SECTION - A
(Attempt all questions from this Section.)

QUESTION 1.
Choose the correct answers to the questions from the given options.
(Do not copy the questions, write the correct answer only.)

(i) Which of these will act as a non-electrolyte?

(a) Liquid carbon tetrachloride (b) Acetic acid
(c) Sodium hydroxide aqueous solution acid (d) Potassium chloride aqueous solution.

(ii) The aqueous solution of the following compounds which contains both ions and molecules is :
(a) Sulphuric acid (b) Hydrochloric acid.
(c) Nitric acid (d) Acetic acid.

(iii) Assertion (A): The elements of the halogen family are not metallic in nature.
Reason (R): Halogens have seven electrons in their valence shell and exist as diatomic molecules in their
natural state.
(a) Both A and R are true, and R is the correct explanation for A.
(b) Both A and R are true, but R is not the correct explanation for A.
(c) A is true, but R is false.
(d) A is false, but R is true.

(iv) Which gas is evolved when HCl react with calcium carbonate?
(a) CO 2 (b) H 2
(c) SO 2 (d) H 2 S

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(v) An element used in atomic clocks :

(a) Rhodium (b) Cesium
(c) Francium (d) Radon

(vi) If empirical formula of an organic compound is CH2O, then its molecular formula can be :
(a) C6H12O6 (b) C2H4O

(c) C3H6O (d) C2H2O2

(vii) Which the gas evolved when the following reactions takes place:
(a) CO 2 (b) H 2

(c) SO 2 (d) H 2 S

(viii) The most reactive non-metals comprise Group ............... of the Periodic Table.
(a) 14 (b) 15
(c) 17 (d) 16

(ix) A solution used for dissolving noble metals.

(a) Ammonia (b) Urea
(c) Nitrosyl Chloride (d) Aqua Regia

(x) Density of alkali metals .......... (decreases/increases) with atomic number.

(a) remains same (b) decreases
(c) non-uniformly varies (d) increases

(xi) Assertion (A): Nitrogen gas can be obtained by heating ammonium nitrate.
Reason (R): Ammonium nitrate decomposes upon heating to produce nitrogen gas, water vapor, and oxygen
gas.
(a) Both A and R are true, and R is the correct explanation for A.
(b) Both A and R are true, but R is not the correct explanation for A.
(c) A is true, but R is false.
(d) A is false, but R is true.

(xii) The organic compound obtained as the end product of the fermentation of sugar solution is :
(a) Ethanol (b) Methanol
(c) Ethane (d) Methanoic acid

(xiii) Salts of which elements are generally coloured :

(a) Inner-transition (b) Normal
(c) Lanthanide’s (d) Transition

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(xiv) ............ is used as an analytical reagent to identify metal ions in qualitative analysis.
(a) Ammonium Sulphate (b) Ammonium Chloride
(c) Ammonium Carbonate (d) Ammonium Hydroxide

(xv) In a laboratory setting, a chemist identifies an element X that forms a chloride with the formula XCl2. This
chloride is observed to be a solid with a high melting point. Based on the properties of the compound, the
chemist is asked to determine which group of the periodic table element X most likely belongs to. Which of
the following elements would X most likely be similar to?:
(a) Mg (b) Na
(c) Al (d) Si

QUESTION 2.

(i)

(a) What is the ratio of reactants taken in this process ? Why higher weight of ammonium chloride is taken
?
(b) Why conc. sulphuric acid or anhydrous CaCl2 is not used for drying ammonia ?
(c) Can you use ammonium nitrate in the above reaction ? If not, why ?
(d) The reaction mixture is gently heated. Why high temperature is not, used ?
(e) Give two reasons why ammonia is collected by downward displacement of air.

(ii) Match the properties and uses of alloys in List 1 with the appropriate answer from List 2.

List 1 List 2
1. The alloy contains Cu and Zn is hard, silvery and is used in decorative articles. A. Duralumin
2. It is stronger than Aluminium, light and is used in making light tools. B. Brass
3. It is lustrous, hard, corrosion resistant and used in surgical instruments. C. Bronze
4. Tin lowers the melting point of the alloy and is used for soldering purpose. D. Stainless steel
5. The alloy is hard, brittle, takes up polish and is used for making statues. E. Solder

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(iii) Complete the following by choosing the correct answers from the bracket:
(a) Atomic size _____ (increase, decrease) as we move across the period as _____ (number of shells/
number of column) remain same but the _____ (nuclear charge, nuclear discharge) increases.
(b) The number of moles in 11 gm of nitrogen gas is _____ (0.39, 0.49, 0.29). [atomic mass of N=14]
(c) Iron ores are concentrated by _____ (electromagnetic separation, electric separation).
(d) The catalyst used in the conversion of ethene to ethane is commonly _____ (iron, nickel, cobalt).
(e) Aqua regia is a mixture of _____ (one, two, three) part/s of concentrated nitric acid and _____
(one, two, three) part/s of concentrated hydrochloric acid by_____ (weight, volume). In aqua regia,
nitric acid _____ (oxidises, reduces) hydrochloric acid to chlorine.

(iv) Identify the following:

(a) Two metallic oxides which are reduced by Ammonia.
(b) Experiment which demonstrates the extreme solubility of Ammonia.
(c) Identify the substance Q based on the information given: The white crystalline solid ‘Q’ is soluble in
water. It liberates a pungent smelling gas when heated with sodium hydroxide solution.
(d) The acid on mixing with lead nitrate solution produces a white precipitate which is insoluble even on
heating.
(e) Acidic gas which cannot be dried by passing through concentrated Sulphuric acid.

(v) Give the structural formula for the following:

(i) Methanoic acid
(ii) Ethanal
(iii) Ethyne
(iv) Acetone
(v) 2-methyl propane.

SECTION - B
(Attempt any four questions)

QUESTION 3.

(i) (a) What are hydrocarbons ?

(b) State two main groups of aliphatic hydrocarbons with examples.

(ii) Give a chemical test to distinguish between dilute sulphuric acid and dilute hydrochloric acid.

(iii) A student named Riya is studying an element Z with an atomic number of 16. She is asked to analyze the
properties and characteristics of Z based on the periodic table and its chemical behavior.

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(a) State the period and group to which Z belongs.

(b) Is Z a metal or a non-metal ?
(c) State the formula between Z and Hydrogen.
(d) What kind of a compound is this ?

(iv) (a)
(1) What compounds are required for the laboratory preparation of nitric acid ?
(2) Why does pure nitric acid take on a yellowish brown colour when exposed to light ?
(b) Write equation for the following reactions :
(1) Copper and concentrated nitric acid.
(2) Copper oxide and dilute nitric acid.
(c) The first step in the manufacture of nitric acid is the catalytic oxidation of ammonia. What is the name
of the catalyst ?

QUESTION 4.

(i) (a) Name the solution used to react with Bauxite as a first step in obtaining pure aluminium oxide, in the
Bayer’s process.
(b) Write the equation for the reaction where the aluminium oxide for the electrolytic extraction of
aluminium is obtained by heating aluminium hydroxide.

(ii) Calculate the percentage of sodium in sodium aluminium fluoride.

([Na3AlF6] correct to the nearest whole number).
(F = 19; Na = 23; Al = 27)

(iii) What do you observe when ammonia is passed through the following: (Also give equations)
(a) Copper oxide
(b) Lead oxide
(c) Excess chlorine

(iv) To a solution of hydrogen chloride, the following substances are added separately in small portions. Copy
and complete the table given below.

Substance added Gas evolved Odour

1. Sodium sulphite ––––––– –––––––

2. Calcium carbonate ––––––– –––––––

3. Magnesium ribbon ––––––– –––––––

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QUESTION 5.

(i) Write equations for the laboratory preparation of:

Ammonia from Ammonium chloride.

(ii) Name three classes of substances that can react with an acid to form a salt. Give an example of each class,
writing the equation that describes its reaction with suitable acid.

(iii) During her chemistry practicals, a student named Priya is conducting an experiment focused on the
laboratory preparation of hydrochloric acid. She is tasked with answering the following detailed questions
related to the process and understanding the reactions involved in this important procedure
(a) Name the reactants used during the laboratory preparation of hydrochloric acid.
(b) Give suitable reason for choosing the reactants for laboratory preparation.
(c) Write balanced chemical equation for the reaction taking place below 200°C.

(iv) Give the structural formulae of each of the following:

(i) 2-methyl propane
(ii) Ethanoic acid
(iii) Butan-2-ol

QUESTION 6.

(i) How does Avogadro’s law explain Gay-Lussac’s law of gaseous volumes ?

(ii) 40 cm3 of methane reacts with chlorine as per the following reactions.
CH4(g) + 2Cl2(g) $ CH2Cl2(g) + 2HCl(g)
Find the volume of HCl and chlorine gas formed.

(iii) (a) What should be the physical state of the lead bromide if it is to conduct electricity?
(b) What particles are present in pure lead bromide?
(c) Write the equations for the reactions which take place at electrodes during the electrolysis of lead
bromide.

(iv) With respect to the electrolysis of lead bromide, answer the following questions :
(a) Why is the lead bromide maintained in a molten state?
(b) Why is the electrolytic cell made of silica?
(c) Name the ions present in the electrolyte.

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QUESTION 7.

(i) Name the following :

(a) Process by which ethane is obtained from ethene.
(b) A hydrocarbon which contributes towards the greenhouse effect.
(c) Distinctive reaction that takes place when ethanol is treated with acetic acid.

(ii) Write balanced chemical equation to support each of the statement given below (use only dilute sulphuric
acid).
(a) Base + Acid $ Salt + Water
(b) Active metal + Acid $ Salt + Hydrogen
(c) Metallic carbonate + Acid $ Salt + Water + Carbon dioxide

(iii) The element belongs to third period and group IIIA or 13.

Group number IA IIA IIIA IVA VA VIA VIIA 0

1 2 13 14 15 16 17 18

2nd period Li D O J Ne
A Mg E Si H M
R T I Q U Y

1. In this table, H does not represent hydrogen.

2. Some elements are given in their own symbol and position in the periodic table while others are shown
with a letter.
With reference to the table, answer the following questions :
(a) Identify the most electronegative element.
(b) Identify the most reactive element of group 1.
(c) Identify the element from period 3 with least atomic size.
(d) How many valence electrons are present in Q?

QUESTION 8.

(i) Give a chemical test to distinguish between calcium nitrate solution and zinc nitrate solution.

(ii) On the basis of the knowledge of electronic configuration of elements, predict the nature of bonds in each
of the following molecules.
N2, CO2, HCl, MgCl2, CCl4, HCN

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(iii) Some properties of sulphuric acid are listed below. Choose the property A, B, C, or D which is responsible
for the reactions ^ i h to ^v h . Some properties may be repeated:
(A) Acid
(B) Dehydrating agent
(C) Non-volatile acid
(D) Oxidizing agent
(a) C 12 H 22 O 11 + nH 2 SO 4 $ 12C + 11H 2 O + nH 2 SO 4
(b) NaCI + H 2 SO 4 $ NaHSO 4 + HCl
(c) CuO + H 2 SO 4 $ CuSO 4 + H 2 O

(iv) In her chemistry class, a student named Rohit is conducting a series of reactions and is required to make
relevant observations. Help Rohit by answering the following questions:
(a) Ammonium hydroxide solution is first added in a small quantity and then in excess to a solution of
copper sulphate.
(b) Sodium acetate is added to sodium hydroxide.
(c) Ammonia gas is passed over heated copper oxide.

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ICSE 10th Chemistry Sample Paper 02 Page 1

Sample Paper 02
ICSE Class X 2024-25
Chemistry
Science Paper - 2
Time: 2 Hours Max. Marks: 80
General Instructions:
1. Answer to this Paper must be written on the paper provided separately.
2. You will not be allowed to write during first 15 minutes.
3. This time is to be spent in reading the question paper.
4. The time given at the head of this Paper is the time allowed for writing the answers.
5. Section A is compulsory. Attempt any four questions from Section B.

SECTION - A
(Attempt all questions from this Section.)

QUESTION 1.
Choose the correct answers to the questions from the given options.
(Do not copy the questions, write the correct answer only.)

(i) Assertion (A): During the electrolysis of molten lead bromide, lead is deposited at the cathode
Reason (R): Lead ions are positively charged and migrate towards the negatively charged
cathode, where they gain electrons and are deposited as lead metal.
(a) Both A and R are true, and R is the correct explanation for A.
(b) Both A and R are true, but R is not the correct explanation for A.
(c) A is true, but R is false.
(d) A is false, but R is true.
(ii) Lime juice has a sour taste while lime water is slightly bitter. Why ?
(a) Lime water is alkaline
(b) Lime juice contains citric acid
(c) Both (a) and (b) are correct
(d) None of the above

(iii) An element in period 2 whose electron affinity is zero:

(a) Carbon (b) Neon
(c) Sodium (d) Sulphur

(iv) The aqueous solution of the following compounds which contains both ions and molecules is:
(a) Sulphuric acid (b) Acetic acid
(c) Nitric acid (d) Hydrochloric acid

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(v) Which is not correct with reference to the elements of group 18?
(a) Zero electron affinity (b) Maximum ionisation energy
(c) Valency is variable (d) Complete octet

(vi) The vapour density of carbon dioxide [C = 12, O = 16]

(a) 32 (b) 16
(c) 44 (d) 22

(vii) Assertion (A): Alkali are bases that are soluble in water.
Reason (R): All alkalis are bases, but not all bases are alkalis, as only those bases that dissolve in water are
called alkalis.
(a) Both A and R are true, and R is the correct explanation for A.
(b) Both A and R are true, but R is not the correct explanation for A.
(c) A is true, but R is false.
(d) A is false, but R is true.
(viii) Ionisation potential increases across a period from left to right because the
(a) Atomic radius increase and nuclear charge increases
(b) Atomic radius decreases and nuclear charge increases
(c) Atomic radius increases and nuclear charge decreases
(d) Atomic radius decreases and nuclear charge decreases

(ix) Nitric acid combines with proteins to form.

(a) Xanthoproteic acid (b) Urea
(c) Nitrosyl Chloride (d) Aqua Regia

(x) Number of elements present in the shortest period.

(a) 8 (b) 2
(c) 18 (d) 32

(xi) The acid which can produce carbon from cane sugar is :
(a) Concentrated Hydrochloric acid (b) Concentrated Nitric acid
(c) Concentrated Sulphuric acid (d) Concentrated Acetic acid

(xii) The organic compound which undergoes substitution reaction is

(a) C2H6 (b) C2H4
(c) Cl0H18 (d) C2H2

(xiii) In a laboratory, a student is testing the solubility of various metal hydroxides in different reagents. The
student first adds caustic soda (NaOH) to each of the metal hydroxides to check their solubility. While
some hydroxides dissolve, one specific metal hydroxide remains insoluble. The student then adds excess
ammonium hydroxide (NH4OH) to this insoluble hydroxide and observes that it becomes soluble in excess
NH4OH.Which of the following metal hydroxides could the student be working with?
(a) Zn(OH)2 (b) Cu(OH)2
(c) CO(OH)2 (d) None of these

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(xiv) The specific gravity of ammonia is .......... .

(a) 0.59 (b) 0.49
(c) 0.48 (d) 0.68

(xv) The metallic character ............... in a group as one moves from top to bottom.
(a) remains same (b) decreases
(c) increases (d) none of the above

QUESTION 2.

(i) The diagram shows below an experimental set up for the laboratory preparation of pungent smelling gas:

Figure: Laboratory preparation of ammonia from ammonium chloride.

The gas is alkaline in nature

(a) Name the gas collected in jar.
(b) Write balanced equation for the above preparation.
(c) How is gas being collected?
(d) Name the drying agent used.
(e) How will you find that the jar is full of gas.

(ii) Match the following column-I with column-II:

Column-I Column-II
(i) Aluminium carbide and water (a) Ethyne
(ii) Calcium carbide and water (b) Ethanol
(iii) Ethene and water (c) Ethanal
(iv) Ethyne and water (d) Ethene
(v) Acetic acid and alcohol (e) Methane
(vi) Ethyl bromide and alcoholic KOH (f) Ester

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(iii) Complete the following by choosing the correct answers from the bracket:
(a) Metals form ______ (Ionic, non-ionic) chlorides.
(b) An alloy used to make statues is ______ (bronze, brass, fuse metal).
(c) Ammonia gas is collected by ______ (an upward displacement of air, a downward displacement of
water, a downward displacement of air).
(d) When acetaldehyde is oxidized with acidified potassium dichromate, it forms ______ (ester/ethanol/
acetic acid).
(e) Inert gases have _____ (maximum, minimum) ionisation energy.

(iv) Identify the following:

(a) Normal salt and acid salt of Sulphuric acid.
(b) The acid that is a dehydrating as well as a drying agent.
(c) An element having highest electro-negativity.
(d) An element of period which does not form an oxide.
(e) A non-metal which has three electrons in the outermost shell.

(v) (a) Distinguish between the saturated hydrocarbon ethane and the unsaturated hydrocarbon ethene by
drawing their structural formulae.
(b) Addition reactions and substitution reactions are type of organic reactions. Which type of reaction is
shown by :
(1) ethane
(2) ethene
(c) Write the equation for the complete combustion of ethane.
(d) (1) Why is pure acetic acid known as glacial acetic acid ?
(2) What type of compound is formed by the reaction between acetic acid and an alcohol ?

SECTION - B
(Attempt any four questions.)

QUESTION 3.

(i) Write the following properties of ethylene :

(a) Physical state
(b) Odour
(c) Density as compared to air
(d) Solubility

(ii) (a) Write the equation for the reaction between zinc and final product of the contact process.
(b) Name the anion present in the compound D which when warmed with dilute sulphuric acid gives a gas
which turns acidified potassium dichromate solution green.

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(iii) A scientist is studying a group of elements from the periodic table to understand their properties and
behavior. The group of elements includes Boron, Aluminium, Gallium, Indium, and Thallium, with Boron
being the first member and Thallium the last. The scientist needs to compare their metallic character,
electronegativity, and electronic configurations to better understand their chemical properties.
Based on this information, answer the following questions:
(a) Which element has the most metallic character ?
(b) Which element would be expected to have the highest electro-negativity ?
(c) If the electronic configuration of Aluminium is 2, 8, 3, how many electrons are there in the outer shell
of Thallium ?

(iv) (a) Explain why only all glass apparatus should be used for the preparation of nitric acid by heating
concentrated sulphuric acid and potassium nitrate.
(b) Write a chemical equation to illustrate the acidic nature of nitric acid.

QUESTION 4.

(i) The sketch below illustrates the refining of aluminium by Hoope’s process.

(a) Which of A and B is the cathode and which one is the anode?
(b) What is the electrolyte in the tank?

(ii) 560 mL of carbon monoxide is mixed with 500 mL of oxygen and ignited. The chemical equation for the
reaction is as follows :
2CO + O2 $ 2CO2
Calculate the volume of oxygen used and carbon dioxide formed in the above reaction.

(iii) Give balanced equations for the reducing reactions of ammonia with :
(a) CuO
(b) PbO
(c) Chlorine : (1) excess NH3, (2) excess Cl2

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(iv) Give reasons for the following :

(a) Hydrogen chloride gas is collected by the upward displacement of air.
(b) Hydrogen chloride gas is not collected over water.
(c) For the preparation of hydrochloric acid, hydrogen chloride is not directly absorbed in water.

QUESTION 5.

(i) A chemistry teacher is preparing a table to explain certain properties of elements to students. However, a
few spaces in the table are left blank, labeled as C, D, and E. The teacher asks the students to analyze the
information and identify the missing values based on their understanding of the periodic table and chemical
properties.Analyze the given table

Lab preparation of Reactants used Products formed Drying agent Method of collection
NH3 gas C Mg(OH)2 NH3 D E
–––––– –––––– –––––––

(ii) Solution A has a pH of 12, solution B has a pH of 5 and solution C has a pH of 3.

Which solution ?
(a) will liberate ammonia from ammonium sulphate on heating ?
(b) is a strong acid.
(c) contains molecules as well as ions.

(iii) Explain the following.

(a) Dilute nitric acid is generally considered a typical acid except for its reaction with metals.
(b) The reaction of dilute nitric acid with copper.
(c) The yellow colour that appears in concentrated nitric acid when it is left standing in an ordinary glass
bottle.

(iv) Write a balanced chemical equation for each of the following:

(a) Burning of ethane in plentiful supply of air.
(b) Action of water on Calcium carbide.
(c) Heating of Ethanol at 170°C in the presence of conc. Sulphuric acid.

QUESTION 6.

(i) What is the mass in grams of

(a) 2 moles of water?
(b) 0.25 mole of Calcium carbonate?

(ii) (a) State your observation with an equation on mixing a solution of CaCl2 with a solution of Na2CO3.
(b) Give the name and formula of acid salt which gives sodium ions and sulphate ions.

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ICSE 10th Chemistry Sample Paper 02 Page 7

(iii) A jeweler is preparing to electroplate a metal article with silver to improve its appearance and durability.
The process involves setting up an electrolytic cell and using silver as a coating material. To understand the
process better, the jeweler needs to answer the following questions:
(a) Name the electrode formed by the article to be plated.
(b) What ions must be present in the electrolyte?
(c) What should be the nature of anode?
(d) How is the passage of electricity through electrolyte is different from the passage of electricity through
a Copper wire?

(iv) During the electrolysis of copper (II) sulphate solution using platinum as cathode and carbon as anode :
(a) What do you observe at the cathode and at the anode ?
(b) What change is noticed in the electrolyte ?
(c) Write the reactions at the cathode and at the anode.

QUESTION 7.

(i) Write the formula of the following :

(a) Methane
(b) Ethane
(c) Methyl alcohol

(ii) Write balanced equations to satisfy each statement:

(a) Acid + Chloride " Salt + Hydrochloric acid gas
(b) Acid + Carbonate " Salt + Water + Carbon dioxide
(c) Acid + Sulphite " Salt + Water + Sulphur dioxide

(iii) Use the letters only written in the Periodic Table given below to answer the questions that follow :

(a) State the number of valence electrons in atom J.

(b) Which element shown forms ions with a single negative charge ?
(c) Which metallic element is more reactive than R ?
(d) Which element has its electrons arranged in four shells ?

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QUESTION 8.

(i) A chemist is analyzing different solutions in a laboratory to identify the cations present in
them. The chemist performs several reactions by adding sodium hydroxide (NaOH) and
ammonium hydroxide (NH4OH) to these solutions and observes specific precipitates. Based
on the observations, the chemist needs to identify the cations present in each solution.
Based on these observations, answer the following::
(a) NaOH solution when added to the solution (A)gives a reddish brown precipitate.
(b) NH4OH solution when added to the solution (B) gives white ppt which does not dissolve in excess.
(c) NaOH solution when added to solution (C) gives white ppt which is insoluble in excess.

(ii) What are the conditions for the formation of an electrovalent bond ?

(iii) (a) What are the two steps necessary to change lead carbonate into lead chloride ?
(b) Give the name of a soluble lead salt and write the equation for the action of heat on this salt.
(c) Write the equation for the preparation of nitric acid from potassium nitrate.

(iv) Element X is a metal with a valency of 2, Y is a non-metal with a valency of 3.

(a) Write an equation to show how Y forms an ion?
(b) If Y is a diatomic gas, write an equation for the direct combination of X and Y to form a compound.
(c) To which group does this metal X belongs to?

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ICSE 10th Chemistry Sample Paper 03 Page 1

Sample Paper 03
ICSE Class X 2024-25
Chemistry
Science Paper - 2
Time: 2 Hours Max. Marks: 80
General Instructions:
1. Answer to this Paper must be written on the paper provided separately.
2. You will not be allowed to write during first 15 minutes.
3. This time is to be spent in reading the question paper.
4. The time given at the head of this Paper is the time allowed for writing the answers.
5. Section A is compulsory. Attempt any four questions from Section B.

SECTION - A
(Attempt all questions from this Section.)

QUESTION 1.
Choose the correct answers to the questions from the given options.
(Do not copy the questions, write the correct answer only.)

(i) During ionization metals lose electrons, this change can be called:
(a) Oxidation (b) Reduction
(c) Redox (d) Displacement

(ii) Anhydrous iron (III) chloride is prepared by

(a) direct combination (b) simple displacement
(c) decomposition (d) neutralisation reaction

(iii) Among the elements given below, the element with the least electro-negativity is :
(a) Lithium (b) Carbon
(c) Boron (d) Fluorine

(iv) Assertion (A): A dilute base has a relatively low percentage of base in its aqueous solution.
Reason (R): Dilute solutions contain a small amount of solute (base) dissolved in a large amount of solvent
(water).]
(a) Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion
(A).
(b) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion
(A).
(c) Assertion (A) is true, but Reason (R) is false.
(d) Assertion (A) is false, but Reason (R) is true.

(v) A base having a relatively low percentage of base in its aqueous solution
(a) Dilute acid (b) Concentrated acid
(c) Concentrated base (d) Dilute base
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(vi) The number of electron shells in the elements of period 3,

(a) One (b) Two
(c) Four (d) Three

(vii) Assertion (A): The number of atoms present in one molecule of an element is called its atomicity.
Reason (R): Atomicity refers to the number of atoms of the same element that combine to form a single
molecule of that element.
(a) Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion
(A).
(b) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion
(A).
(c) Assertion (A) is true, but Reason (R) is false.
(d) Assertion (A) is false, but Reason (R) is true.

(viii) An acid which contains four hydrogens but is monobasic.

(a) Sulphuric acid (H2SO4) (b) Hydrochloric Acid (HCl)
(c) Nitric Acid (HNO3) (d) Acetic Acid (CH3COOH)

(ix) Suresh, a chemistry student, is studying Group 16 elements in the periodic table. He knows that these
elements have 6 valence electrons and now needs to determine their valency. Elements of Group 16 have 6
valence electrons. The valency of Group 16 elements is:
(a) 5 (b) 6
(c) 3 (d) 2

(x) Chile salt petre has the chemical formula :

(a) Mg(NO3)2 (b) KNO3
(c) NaNO3 (d) HNO3

(xi) The set representing the correct order of first ionisation energy is
(a) Be > Mg > Ca (b) K > Na > Li
(c) B > C > N (d) Ge > Si > C

(xii) Nitric acid was also called as

(a) aqua-regia (b) aqua nitrate
(c) aqua fortis (d) aqua hydroxide

(xiii) The organic compound mixed with alcohol to make it spurious is :

(a) Methanoic acid (b) Methanol
(c) Methanal (d) Ethanoic acid

(xiv) Which solution becomes a deep/inky blue colour when excess of ammonium hydroxide is added to it.
(a) Lead nitrate (b) Iron [II] sulphate
(c) Iron [III] chloride (d) Copper nitrate

(xv) Nitrogen gas can be obtained by heating :

(a) Ammonium nitrate (b) Ammonium chloride
(c) Magnesium nitride (d) Ammonium nitrite

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ICSE 10th Chemistry Sample Paper 03 Page 3

QUESTION 2.

(i) In the preparation of ammonia in industry, the raw materials are nitrogen and hydrogen. These are mixed
together in the correct proportions needed to form ammonia.
(a) Write the balanced equation for the manufacture of ammonia.
(b) How much hydrogen would be there in 400 litres of gaseous mixture required for the manufacture of
ammonia ?
(c) (1) If all nitrogen and hydrogen used were converted into ammonia, find the volume of ammonia
formed.
(2) How would the volume of ammonia formed compare with the volume of original mixture ?
(d) The formation of ammonia from its elements is an exothermic reaction. What is meant by exothermic ?

(ii) Match the column A with column B:

Column A Column B
1. Sodium chloride (a) Increases
2. Ammonium ion (b) Covalent bond
3. Electro-negativity across the period (c) Ionic bond
4. Non metallic character down the group (d) Covalent and Co-ordinate bond
5. Carbon tetrachloride (e) Decreases

(iii) Complete the following by choosing the correct answers from the bracket:
(a) If an element has seven electrons in its outermost shell then it is likely to have the _____ (largest/
smallest) atomic size among all the elements in the same period.
(b) In covalent compounds, the bond is formed due to the______(sharing/transfer) of electrons.
(c) The chemical compound present in Zinc blende is ______ .
(d) Substitution reactions are characteristic reactions of______. (alkynes/alkenes/alkanes)
(e) Iron reacts with hydrogen chloride gas forming_____ (iron (II) chloride, iron (III) chloride)
and hydrogen. The reaction is an example of______ (double decomposition, synthesis, simple
displacement).

(iv) Identify the following:

(a) Solvent for Silver chloride.
(b) Orange compound which on heating erupts with green mass in the form of volcano.
(c) Gas obtained when Magnesium nitride is warmed with water.
(d) The gas produced when excess ammonia reacts with chlorine.
(e) Identify the gas evolved in the following reaction when: Sulphur is treated with concentrated nitric acid.

(v) Give chemical equation for

(a) The laboratory preparation of methane from sodium acetate.
(b) The industrial preparation of methanol from water gas.
(c) The reaction of one mole of ethene with one mole of chlorine gas.
(d) The preparation of ethyne from 1, 2—dibromoethane.
(e) The preparation of copper hydroxide and ammonium nitrate from copper nitrate.

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SECTION - B
(Attempt any four questions.)

QUESTION 3.

(i) Give the balanced equation for lab preparation of ethylene. How is the gas collected and dried ?

(ii) Give a chemical test to distinguish between the following pair of compounds :
Carbon dioxide gas and sulphur dioxide gas.

(iii) What are the units of electron affinity ? Also give the factors which influence electron affinity.

(iv) Answer the questions below, relating your answers only to salts in the following list : Sodium chloride,
anhydrous Calcium chloride, Copper sulphate -5- water.
(a) What name is given to the water in the compound, copper sulphate -5- water ?
(b) If copper sulphate -5- water is heated, anhydrous copper sulphate is formed. What is its colour ?
(c) By what means other than heating, could you dehydrate copper sulphate -5- water and obtain anhydrous
copper sulphate ?

QUESTION 4.

(i) Explain why :

(a) In the electrolysis of alumina using the Hall Heroult’s Process, the electrolyte is covered with powdered
coke.
(b) Iron sheets are coated with zinc during galvanization.

(ii) Rajendra, a chemistry student, is tasked with determining the molecular formula of a compound made of
two elements, X and Y, based on its empirical formula, atomic weights, and vapor density. A compound
made up of two elements X and Y has an empirical formula X2Y. If the atomic weight of X is 10 and that
of Y is 5 and the compound has a vapour density 25, find its molecular formula.

(iii) Complete the following table.

(iv) The type of reaction between ethane and chlorine is different from that between ethene and chlorine.
(a) What is the type of reaction that has taken place between ethene and chlorine ?
(b) What feature of the ethene structure makes such a reaction possible ?
(c) Name the product of the reaction between ethene and chlorine.

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QUESTION 5.

(i) Copy and complete the following table relating to important industrial processes. Output refers to the
product of the process not the intermediate steps.

Name of process Inputs Catalyst Equation for catalysed reaction Output

Haber’s Process Hydrogen + ____ ____ ____ ____

(ii) What is the pH of the following solutions?

(a) Ferric chloride
(b) Sodium acetate

(iii) Arrange the following as per the instructions given in the brackets.
(a) Na, Mg, Al, Si, Cl (increasing order of non-metallic character).
(b) Li, Be, C, O, F (decreasing order of metallic character).
(c) Mg, Al, Na, Si (increasing order of atomic size).

(iv) Suresh, a chemistry student, is observing an experiment involving gas Y in the laboratory. Based on the
figure provided, he needs to answer the following questions about the gas and its properties.

Study the figure given above and answer the questions that follow:
(a) Identify the gas Y.
(b) What property of gas Y does this experiment demonstrate ?
(c) Name another gas which has the same property and can be demonstrated through this experiment.

QUESTION 6.

(i) Chlorine has atomic weight 35.5. Give reasons.

(ii) Identify the gas released when the following reactions takes place.
(a) Concentrated H2SO4 react with copper to release this gas, that turns acidified potassium dichromate
solution green and decolourise the pink colour of potassium permangariate solution.
(b) Nitric acid undergoes decomposition to release this gas, which finds its use in ozone molecule formation.

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(iii) What will you observe (a) at cathode (b) at anode (c) in electrolyte during the electrolysis of Copper
sulphate solution with Copper electrodes?

(iv) Write the cell reactions for the following:

(a) Electrolysis of conc. solution of CuSO4 (Cu electrodes)
(b) Dilute AgNO3 solution using Ag anode and Cu cathode.

QUESTION 7.

(i) Name the organic compound prepared by each of the following reactions:
(a) C 2 H 5 COONa + NaOH $
(b) CH 3 I + 2 [H] $
(c) C 2 H 5 Br + KOH (alcoholic solution) $

(ii) Solutions A , B , C and D are having pH 1, 5, 8 and 14 respectively. In this context, answer the following
questions.
(a) Choose the solutions which are acidic in nature.
(b) Choose the solutions which are basic in nature.
(c) Choose the solutions which are highly acidic and highly alkaline.

(iii) (a) Explain why only all glass apparatus should be used for the preparation of nitric acid by heating
concentrated sulphuric acid and potassium nitrate.
(b) Write a chemical equation to illustrate the acidic nature of nitric acid.
(c) Name the products formed when ammonium nitrate is heated.

QUESTION 8.

(i) State one observation for each of the following:

(a) Excess ammonium hydroxide solution is added to lead nitrate solution.
(b) Sodium hydroxide solution is added to ferric chloride solution at first a little and then in excess.

(ii) Why is methane molecule regarded as a non polar covalent compound ?

(iii) Name the products formed when hot and concentrated sulphuric acid reacts with the following :
(a) Sulphur
(b) NaOH
(c) Sugar

(iv) Following questions are regarding the electrolysis. Answer each of them
(a) The substance in which alumina is dissolved before subjecting it to electrolysis.
(b) The products formed at cathode in the electrolysis of alumina.
(c) The product formed at anode during the electrolysis of alumina.

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ICSE 10th Chemistry Sample Paper 04 Page 1

Sample Paper 04
ICSE Examination Class X 2024-25
Chemistry
Science Paper - 2
Time: 2 Hours Max. Marks: 80
General Instructions:
1. Answer to this Paper must be written on the paper provided separately.
2. You will not be allowed to write during first 15 minutes.
3. This time is to be spent in reading the question paper.
4. The time given at the head of this Paper is the time allowed for writing the answers.
5. Section A is compulsory. Attempt any four questions from Section B.

SECTION - A
(Attempt all questions from this Section.)

QUESTION 1.
Choose the correct answers to the questions from the given options.
(Do not copy the questions, write the correct answer only.)

(i) The inert electrode used in the electrolysis of acidified water is :

(a) Nickel (b) Platinum
(c) Copper (d) Silver

(ii) Select the acid which contains four hydrogen atoms in it.
(a) Formic acid (b) Sulphuric acid
(c) Nitric acid (d) Acetic acid

(iii) In the periodic table, alkali metals are placed in the group :
(a) 1 (b) 11
(c) 17 (d) 18

(iv) When dilute sulphuric acid reacts with iron sulphide, the gas evolved is.
(a) Vapours of sulphuric acid (b) Sulphur dioxide
(c) Sulphur trioxide (d) Hydrogen sulphide
(v) Beryllium exhibits diagonal relationship with .......... .
(a) fluorine (b) calcium
(c) magnesium (d) aluminium

(vi) Assertion: The molecular mass of ammonia (NH3) is 17 g.

Reason: The molecular mass of ammonia is the sum of the atomic masses of nitrogen (14 g/mol) and three
hydrogen atoms (1 g/mol each), which equals 17 g/mol.
(a) Both Assertion and Reason are correct, and Reason is the correct explanation for Assertion.
(b) Both Assertion and Reason are correct, but Reason is not the correct explanation for Assertion.
(c) Assertion is correct, but Reason is incorrect.
(d) Assertion is incorrect, but Reason is correct.

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(vii) Hydrochloric acid is considered as a strong acid whereas acetic acid is a weak acid. Why ?
(a) Because it dissociates partially when dissolved in water.
(b) Because it dissociates completely in water.
(c) Both (a) and (b) are correct
(d) None of the above

(viii) Moving across a ............... of the periodic table, the elements show increasing ............... character.
(a) group, non-metallic (b) group, metallic
(c) period, non-metallic (d) period, metallic

(ix) Assertion : A gas that dissolves in water to form an acid is known as an acid anhydride.
Reason : Acid anhydrides are oxides of non-metals that react with water to form acids.
(a) Both Assertion and Reason are correct, and Reason is the correct explanation for Assertion.
(b) Both Assertion and Reason are correct, but Reason is not the correct explanation for Assertion.
(c) Assertion is correct, but Reason is incorrect.
(d) Assertion is incorrect, but Reason is correct.

(x) In a chemistry class, students are studying the periodic table and are given a list of elements labeled A, B,
C, D, and E, with their respective atomic numbers: 9, 11, 17, 12, and 30. The students need to determine
which of these elements belong to the same period. The options provided are:
(a) A and B (b) B and D
(c) D and E (d) A and C

(xi) The compound responsible for the brown ring during the brown ring test of nitrate ion.
(a) Nitrosoiron(II) sulphate (b) Iron(III) chloride
(c) Chromium sulphate (d) Lead(II) chloride

(xii) Isomerism shown by pent-1 -yne and 3-methylbut-l-yne is

(a) functional isomerism (b) position isomerism
(c) chain isomerism (d) stereo isomerism

(xiii) Amphoteric oxides and hydroxides react with an ............... , ............... to give salt and water only.
(a) Acid, Alkali (b) Base, Alkali
(c) Acid , Base (d) None of these

(xiv) ............. is the dilute solution of liquor ammonia.

(a) Blue Vitriol (b) Mohr’s Salt
(c) Bench Reagent (d) Vinegar

(xv) The alkali metal in the period 2 is

(a) Berrylium (b) Boron
(c) Lithium (d) Carbon

QUESTION 2.

(i) (a) Name :

(1) A gas which dissolves in water to give alkaline solution.
(2) An oxidising agent which does not contain any oxygen.
(b) State the products of following reactions :
(1) Ammonium nitrate is heated.
(2) A well ground mixture of ammonium chloride and slaked lime is heated.

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ICSE 10th Chemistry Sample Paper 04 Page 3

(ii) Match the column A with column B:

Column A Column B
1. Acid salt A. Ferrous ammonium
2. Double salt B. Contains only ions sulphate
3. Ammonium hydroxide solution C. Sodium hydrogen sulphate
4. Dilute hydrochloric acid D. Contains only molecules
5. Carbon tetrachloride E. Contains ions and molecules

(iii) Complete the following by choosing the correct answers from the bracket:
(a) On moving from left to right in the second period, the number of valence electrons _____.
(b) Electrovalent compounds have _____ (high/low) melting points.
(c) The most common ore of Aluminium is _____.
(d) The conversion of ethene to ethane is an example of _____ (hydration, hydrogenation).
(e) Addition of _____ (iron (III) sulphide, iron(II) sulphide, iron pyrites) to dilute hydrochloric acid
results in liberation of hydrogen sulphide gas.

(iv) Identify the following:

(a) The industrial process by which Ammonia is manufactured.
(b) Drying agent for Ammonia.
(c) An alkaline gas (A) which gives dense white fumes with hydrogen chloride.
(d) The gas that can be oxidised to sulphur.
(e) A neutral oxide of Carbon formed when Formic acid reacts with concentrated Sulphuric acid.

(v) (a) Name the product formed (give equations)

(i) When ethyl iodide is reduced completely.
(ii) Chlorinated product of ethane with camphor like smell.
(iii) When ethyl bromide is treated with alc. KOH
(b) Give the structural formulae for the following:
(i) An isomer of n-butane.
(ii) 2-propanol.

SECTION - B
(Attempt any four questions.)

QUESTION 3.

(i) How would you convert :

(a) Ethylene to 1, 2-dibromoethane ?
(b) Ethylene to ethyl bromide ?

(ii) Write balanced equations for the following reactions :

(a) Potassium hydrogen carbonate and dilute sulphuric acid.
(b) Sodium nitrate and concentrated sulphuric acid.

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(iii) (a) How many elements are there in the periodic table in the ?
(1) first period
(2) second period
(3) third period
(b) Name all the elements of the first period.
(c) How does the atomic size of elements change while moving in a period from left to right?

(iv) During thunderstorm, rainwater contains nitric acid. Explain with reactions.

QUESTION 4.

(i) The following is an extract from ‘Metals in the Service of Man, Alexander and Street/Pelican 1976.’
‘Alumina (aluminium oxide) has a very high melting point of over 2000°C so that it cannot readily be
liquefied. However, conversion of alumina to aluminium and oxygen, by electrolysis, can occur, when it is
dissolved in some other substance :
(a) Which solution is used to react with bauxite as a first step in obtaining pure aluminium oxide ?
(b) The aluminium oxide for the electrolytic extraction of aluminium is obtained by heating aluminium
hydroxide. Write the equation for this reaction.

(ii) The equation 4NH3 + 5O2 $ 4NO + 6H2O, represents the catalytic oxidation of ammonia. If 100 cm3 of
ammonia is used, calculate the volume of oxygen required to oxidise the ammonia completely.

(iii) Distinguish between liquid ammonia and liquid ammonia fortis.

(iv) Refer to the flow chart below and give balanced equations with conditions, if any, for the following conversions
A to D.

QUESTION 5.

(i) You enter a laboratory after a class has completed the Fountain experiment. How will you be able to tell
whether the gas used in the experiment was Hydrogen chloride or Ammonia?

(ii) What is hydronium ion ? Write the ionisation of hydrochloric acid showing the formation of hydronium ion.

(iii) Name the ions present in each of the following:

(a) NaCl
(b) CH3COOH
(c) H2O

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ICSE 10th Chemistry Sample Paper 04 Page 5

(iv)
From the box given above name :
(a) The compounds with –OH as a part of its structure.
(b) The compounds with –COOH as a part of its structure.
(c) Homologues and Homologous series with general formula, C n H 2n .

QUESTION 6.

(i) Under the same conditions of temperature and pressure you collect 2 litres of carbon dioxide, 3 litres of
chlorine, 5 litres of hydrogen, 4 litres of nitrogen and 1 litre of sulphur dioxide. In which gas sample will
there be ?
(a) the greatest number of molecule.
(b) the least number of molecules.

(ii) Distinguish between the following as directed.

(a) Magnesium chloride and ferric chloride using NaOH.
(b) Copper sulphate and zinc sulphate using NaOH.

(iii) The following questions relate to the electroplating of an article with nickel :
(a) Name the electrode formed by the article to be plated.
(b) What ions must be present in the electrolyte?
(c) What should be the nature of the anode ?

(iv) The following questions refer to the electrolysis of Copper sulphate solution with Copper electrode:
(a) Compare the change in mass of the cathode with the change in mass of the anode.
(b) What is seen to happen to the colour of the Copper sulphate solution if Platinum electrodes are used?
Explain this observation.
(c) What is the practical application of the electrolysis of Copper sulphate solution? Briefly describe one
such application.

QUESTION 7.

(i) Give any four uses of ethanoic acid.

(ii) Write balanced chemical equation to support each of the statement given below (use only dilute sulphuric
acid).
(a) Basic oxide + Acid $ Salt + Water
(b) Amphoteric oxide + Acid $ Salt + Water
(c) Alkali + Acid $ Salt + Water

(iii) Name :
(a) The compound responsible for the brown ring during the brown ring test of nitrate ion.
(b) By the addition of only one solution how would you distinguish between dilute hydrochloric acid and
dilute nitric acid?
(c) The action of heat on the blue crystalline solid L gives a reddish brown gas M, a gas which relights a
glowing splint and leaves a black residue. When gas N, which has a rotten egg smell, is passed through
a solution of L a black precipitate is formed.

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(1) Identify L, M and N (Name of formula)

(2) Write the equation for the action of heat on L.
(3) Write the equation for the reaction between the solution of L and the gas N.

QUESTION 8.

(i) What do you observe when ammonium hydroxide is first added in a small quantity and then in excess to a
solution of copper sulphate?

(ii) An element A has electronic arrangement 2, 8, 2. The element B has electronic configuration 2, 8, 7. Explain
what happens to A and B when they combine to form ionic compound ? Also give the formula of ionic
compound.

(iii) A, B, C and D summarize the properties of sulphuric acid depending on whether it is dilute or concentrated.
A = Typical acid property
B = Non-volatile acid
C = Oxidizing agent
D = Dehydrating agent
Choose the property (A, B, C or D) depending on which is relevant to each of the following :
(a) Preparation of Hydrogen chloride gas.
(b) Preparation of Copper sulphate from copper oxide.
(c) Action of conc. Sulphuric acid on Sulphur.

(iv) Choose the correct word which refers to the process of electrolysis from A to C, to match the description 1
to 3.
A : Oxidation B : Cathode C : An electrolyte
(1) Can conducts electricity in aqueous or in molten state ______.
(2) Loss of electron takes place at anode is called ______.
(3) A reducing electrode is ______.

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ICSE 10th Chemistry Sample Paper 05 Page 1

Sample Paper 05
ICSE Examination Class X 2024-25
Chemistry
Science Paper - 2
Time: 2 Hours Max. Marks: 80
General Instructions:
1. Answer to this Paper must be written on the paper provided separately.
2. You will not be allowed to write during first 15 minutes.
3. This time is to be spent in reading the question paper.
4. The time given at the head of this Paper is the time allowed for writing the answers.
5. Section A is compulsory. Attempt any four questions from Section B.

SECTION - A
(Attempt all questions from this Section.)

QUESTION 1.
Choose the correct answers to the questions from the given options.
(Do not copy the questions, write the correct answer only.)

(i) Solid sodium chloride does not conduct electricity as

(a) the strength of the bond is weak
(b) it contains free ions
(c) it does not contain any free ion
(d) it contains free ions as well as molecules

(ii) The acidity of aluminium hydroxide is

(a) 3 (b) 1
(c) 4 (d) 2

(iii) The tendency of an atom to attract shared pair of electrons to itself when forming a chemical bond is known
as
(a) electron affinity (b) electronegativity
(c) ionisation potential (d) nuclear charge

(iv) Assertion: All metals give hydrogen while reacting with nitric acid.
Reason: Nitric acid is a strong oxidising agent.
(a) Assertion and Reason both are correct statements and reason is the correct explanation of the assertion.
(b) Assertion and Reason both are correct statements, but reason is not the correct explanation of the
assertion.
(c) Assertion is false, but reason is true.
(d) Assertion is true, but reason is false.

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(v) What is the fundamental property of classification in modern periodic law?

(a) Atomic radius (b) Atomic volume
(c) Atomic number (d) Atomic mass

(vi) Assertion : In electrolytes, the current passes by the flow of ions.

Reason : Electrolytes allow the passage of electric current in solid states.
(a) Both assertion and reason are true and reason is the correct explanation of assertion.
(b) Both assertion and reason are true, but reason is not the correct explanation of assertion.
(c) Assertion is true, but reason is false.
(d) Assertion is false, but reason is true.

(vii) The electro-negativity of elements across the period ............... and ............... down the group.
(a) increases; increases (b) decreases; increases
(c) decreases; decreases (d) increases; decreases

(viii) The brown ring test is used for the detection of

(a) NO -3 (b) CO 2-
3

(c) SO 2-
3 (d) Cl-

(ix) Amongst the following select the element with highest ionisation enthalpy.
(a) Sodium (b) Potassium
(c) Magnesium (d) Beryllium

(x) Catalyst used in Ostwald’s process.

(a) Gold (b) Silver
(c) Platinum (d) Silver Nitrate

(xi) The functional group present in acetic acid is:

(a) Ketonic (b) Carboxyl - COOH

(c) Aldehydic - CHO (d) Hydroxyl - OH

(xii) Aqueous solution of cupric chloride forms a deep blue solution on addition of
(a) drop wise sodium hydroxide (b) excess sodium hydroxide
(c) drop wise ammonium hydroxide (d) excess ammonium hydroxide

(xiii) Ammonia turns yellow turmeric solution .......... .

(a) Orange (b) brown
(c) red (d) blue

(xiv) Which of the following is a most reactive element of the group 17?
(a) Sodium (b) Oxygen
(c) Fluorine (d) Magneshium

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(xv) Litmus paper is commonly used to identify acids and bases through color changes. In laboratories, it
provides a quick way to test solutions for their acidic or basic nature. A blue litmus paper was first dipped
in dilute HCl and then in dilute NaOH solution as shown in the figure. It was observed that the color of
the litmus paper.

(a) changed to red (b) remain blue in both the solution

(c) changed blue to colourless (d) changed first to red and then to blue

QUESTION 2.

(i)

(a) Which property of ammonia is depicted in above diagram ?

(b) What is taken is combustion tube ?
(c) Enlist your observations if the compound taken in combustion tube is (1) CuO (2) PbO. (Also give
equations)
(d) Give the function of cold water.

(ii) Match the column A with column B.

Column A Column B
1. Sodium chloride (a) Increases
2. Ammonium ion (b) Covalent bond
3. Electro-negativity across the period (c) Ionic bond
4. Non metallic character down the group (d) Covalent and Co-ordinate bond
5. Carbon tetrachloride (e) Decreases

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(iii) Complete the following by choosing the correct answers from the bracket:
(a) Down the group, electron affinity______. (increases, decreases, remains same).
(b) The salt prepared by the method of direct combination is______. (iron (II) chloride/iron (III)
chloride)
(c) Aluminium is utilized in cooking utensils since it is______. (a good conductor of electricity/bright
in appearance/a good conductor of heat).
(d) Mixing of colourless acids, such as HBr and H 2 SO 4 leads to -------------- colouration.
(e) Quicklime is not used to dry HCl gas because ______(CaO is alkaline, CaO is acidic, CaO is neutral)

(iv) Identify the following:

(a) The energy released when an electron is added to a neutral gaseous isolated atom to form a negatively
charged ion.
(b) An alkaline earth metal in the third period.
(c) A non-metal which has three electrons in the valence shell.
(d) An element of period which does not form an oxide.
(e) The non-metallic element present in third period other than sulphur and oxygen.

(v) Give the structural formula for the following :

(a) Methanoic acid
(b) Ethanal
(c) Ethyne
(d) Acetone
(e) 2-methyl propane.

SECTION - B
(Attempt any four questions.)

QUESTION 3.

(i) Name the following :

(a) A gas which forms explosive mixture with air.
(b) Solution used for storing biological specimens.

(ii) (a) HCl, HNO3 and H2SO4 are the formulae of three compounds.
Which of these compounds has the highest boiling point and which has the lowest ?
(b) Dilute hydrochloric acid and dilute sulphuric acid are both colourless solutions. How will the addition
of barium chloride solution to each, help to distinguish between the two ?

(iii) Consider an element X that belongs to the 3rd period and Group II of the periodic table. Use the following
context and answer the questions based on your knowledge of the periodic table:
X is used in the manufacturing of lightweight structural materials, especially in the
automotive and aerospace industries due to its low density and high strength. This element
is also important in biological processes, particularly in human bones and teeth.

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ICSE 10th Chemistry Sample Paper 05 Page 5

(a) State the number of valence electrons in atom J .

(b) Which element shown forms ions with a single negative charge?
(c) Which metallic element is more reactive than R ?

(iv) (a) A solution has a pH of 7. Explain how you would

(1) increase its pH
(2) decrease its pH
(b) If a solution changes the colour of litmus from red to blue, what can you say about its pH?
(c) What can you say about the pH of a solution that liberates CO2 from sodium carbonate ?

QUESTION 4.

(i) (a) From the metals copper, iron, magnesium, sodium and zinc, select a different metal which does not react
with cold water but reacts with steam when heated.
(b) Arrange the metals in [a] in decreasing order of reactivity.

(ii) Calculate the mass of

(a) 1022 atoms of sulphur.
(b) 0.1 mole of carbon dioxide.
[Atomic mass: S = 32, C = 12 and D = 16 and Avogadro’s Number = 6 # 1023]

(iii) Study the figure given below and answer the questions that follow:

(a) Identify the gas Y .

(b) What property of gas Y does this experiment demonstrate?
(c) Name another gas which has the same property and can be demonstrated through this experiment.

(iv) The following questions are based on the preparation of ammonia gas in the laboratory:
(a) Explain why ammonium nitrate is not used in the preparation of ammonia.
(b) Name the compound normally used as a drying agent during the process.
(c) How is ammonia gas collected?

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QUESTION 5.

(i) Under what conditions do nitrogen and hydrogen combine to form ammonia ? State one large-scale use of
ammonia.

(ii) What are the terms defined below?

(a) A salt containing a metal ion surrounded by other ions or molecules.
(b) A base which is soluble in water.

(iii) Choose the answer from the list which fits the description.
(Calcium silicate, zone of heat absorption, coke, combustion zone, alumina)
(a) Name of the compound which is formed by the reaction between silica and calcium oxide.
(b) Name of the middle part zone of the blast furnace.
(c) A black powdery substance is used for the reduction of zinc oxide during its extraction process.

(iv) Ethene, a versatile hydrocarbon, is widely used in the chemical industry for the production
of various valuable products. Its reactivity with different substances like hydrogen, chlorine,
and heat under specific conditions results in the formation of products that are essential
in numerous applications, including the production of polymers, solvents, and fuels.
Based on this context, write the balanced equations for the following reactions and name the products
formed:
(a) A mixture of ethene and hydrogen is passed over heated nickel.
(b) Ethene is treated with chlorine.
(c) Ethene is heated to 200°C under pressure.

QUESTION 6.

(i) What is the mass in grams of

(i) 2.24 millilitres of propane at S.T.P.?
(ii) 448 millilitres of Nitric oxide at S.T.P.?

(ii) (a) Give the name and formula of the acid salt which gives sodium ions and sulphate ions in solution.
(b) From the following list of substances, choose those which meet the description given below. Ammonium
chloride, ammonium nitrate, chlorine, dilute hydrochloric acid, iron, lead nitrate, manganese (IV) oxide,
silver nitrate, sodium nitrate sulphur. Two compounds whose aqueous solution gives white precipitate
with dilute hydrochloric acid.

(iii) In industrial applications, electrolysis is commonly used for the refining of metals like copper. When
copper(II) sulfate solution undergoes electrolysis using platinum as the cathode and carbon as the
anode, certain reactions occur at the electrodes, which play a critical role in metal purification processes.
Based on this, answer the following questions:
(a) What do you observe at the cathode and at the anode?
(b) What change is noticed in the electrolyte?
(c) Write the reactions at the cathode and at the anode.

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ICSE 10th Chemistry Sample Paper 05 Page 7

(iv) (a) The ions which discharge on the positive electrode during electrolysis______electrons. Thus the ions
are said to be_____.
(b) Hydrogen and metallic ions are______because they______electrons at cathode.
(c) Non-metallic ions are_____because they____electrons at anode.

QUESTION 7.

(i) Compound A is bubbled through bromine dissolved in carbon tetrachloride and the product is
CH 2 BR - CH 2 Br .
Br2 /CCl 4

A CH 2 Br - CH 2 Br
(a) Draw the structural formula of A.
(b) What type of reaction has A undergone?
(c) What is your observation?

(ii) Give suitable chemical terms for the following :

(a) A salt formed by incomplete neutralisation of an acid by a base.
(b) A definite number of water molecules bound to some salts.
(c) The process in which a substance absorbs moisture from the atmospheric air to become moist, and
ultimately dissolves in the absorbed water.

(iii)

The above diagram shows industrial preparation of nitric acid.

(a) What is the ratio of the reactants taken in the above process ?
(b) Name the common name of this process.
(c) Name the catalyst used.
(d) Why gases entering the apparatus must be pure ?

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QUESTION 8.

(i) Distinguish between the following pairs of compounds using a reagent as a chemical test:
(a) Calcium nitrate and Zinc nitrate solution.
(b) Ammonium sulphate crystals and Sodium sulphate crystals.

(ii) Ionic compounds do not conduct electric current in the solid state, why ?

(iii) Write the observations and balanced equations for the following reactions :
(a) Sodium hydroxide is added drop-wise till in excess to a solution of zinc sulphate.
(b) Ammonium hydroxide is added first in a small quantity and then in excess to a solution of copper
sulphate.
(c) Excess of ammonium hydroxide is added to a substance obtained by adding hydrochloric acid in silver
nitrate solution.

(iv) Give reasons:

(a) Pure nitric acid gives a yellow brown colour when exposed to light.
(b) Colourless nitric oxide forms brown fumes in air.
(c) Aluminium is more active metal than iron, but suffers less corrosion.

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ICSE 10th Chemistry Sample Paper 06 Page 1

Sample Paper 06
ICSE Examination Class X 2024-25
Chemistry
Science Paper - 2
Time: 2 Hours Max. Marks: 80
General Instructions:
1. Answer to this Paper must be written on the paper provided separately.
2. You will not be allowed to write during first 15 minutes.
3. This time is to be spent in reading the question paper.
4. The time given at the head of this Paper is the time allowed for writing the answers.
5. Section A is compulsory. Attempt any four questions from Section B.

SECTION - A
(Attempt all questions from this Section.)

QUESTION 1.
Choose the correct answers to the questions from the given options.
(Do not copy the questions, write the correct answer only.)

(i) When fused lead bromide is electrolysed we observe:

(a) a silver grey deposit at anode and a reddish brown deposit at cathode.
(b) a silver grey deposit at cathode and a reddish brown deposit at anode.
(c) a silver grey deposit at cathode and reddish brown fumes at anode.
(d) silver grey fumes at anode and reddish brown fumes at cathode.

(ii) Dilute sulphuric acid will produce a white precipitate when added to a solution of
(a) copper nitrate (b) zinc nitrate
(c) lead nitrate (d) sodium nitrate

(iii) Among the elements of period Second the element which has high electron affinity is :
(a) Lithium (b) Carbon
(c) Chlorine (d) Fluorine

(iv) Absorption of moisture when exposed to atmosphere.

(a) Hydrophobic (b) Hydroscopic substances
(c) Hydrolytic substances (d) None of these

(v) Which of the following properties do not match with elements of the halogen family?
(a) They have seven electrons in their valence shell.
(b) They are highly reactive chemically.
(c) They are diatomic in their molecular form.
(d) They are metallic in nature

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Page 2 Sample Paper 06 NODIA

(vi) The empirical formula mass for acetylene is :

(a) 26 g (b) 13 g
(c) 28 g (d) 14 g

(vii) Assertion: Caesium hydroxide (CsOH) is a very strong alkali and dissociates almost completely in water,
producing a high concentration of hydroxyl (OH-) ions.
Reason: CsOH is more reactive than NaOH, KOH, and Ca(OH)2.
(a) Both Assertion and Reason are correct, and Reason is the correct explanation for Assertion.
(b) Both Assertion and Reason are correct, but Reason is not the correct explanation for Assertion.
(c) Assertion is correct, but Reason is incorrect.
(d) Assertion is incorrect, but Reason is correct.

(viii) The elements in which electrons are progressively filled in 4f orbital are called:
(a) actinoids (b) transition elements
(c) halogens (d) lanthanoids

(ix) The formula of chile salt petre is

(a) KNO3 (b) NaNO3
(c) HNO3 (d) None of these

(x) Match the columns:

Column A Column B
1. Proton A. An alkaline earth metal
2. Sodium B. Halogen
3. Barium C. Noble gas
4. Chlorine D. An alkali metal
5. Electron E. Responsible for nuclear charge
6. Completed shell F. Occupied sub-shell

(a) 1-E, 2-D, 3-A, 4-B, 5-F, 6-C

(b) 1-D, 2-E, 3-C, 4-A, 5-B, 6-F
(c) 1-A, 2-C, 3-F, 4-B, 5-E, 6-D
(d) 1-E, 2-D, 3-A, 4-B, 5-C, 6-F

(xi) Hard crust formed when chile salt petre and sulphuric acid reacts together.
(a) Na2SO4 (b) Na2CO3
(c) NaSiO3 (d) NaCl

(xii) Assertion (A): Amines owe their properties to the amino functional group (-NH2).
Reason (R): The amino group (-NH2) is responsible for the basicity and reactivity of amines in various
chemical reactions
(a) Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion (A).
(b) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion
(A).
(c) Assertion (A) is true, but Reason (R) is false.
(d) Assertion (A) is false, but Reason (R) is true.

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(xiii) A technician is testing a salt solution. Upon adding sodium hydroxide, a pale green precipitate forms, and
with barium chloride, a white precipitate appears. Based on these reactions:
The salt which in solution gives a pale green precipitate with sodium hydroxide solution and a white
precipitate with barium chloride solution is
(a) Iron (III) sulphate (b) Iron (II) sulphate
(c) Iron (II) chloride (d) Iron (III) chloride

(xiv) .......... is used for reviving a fainted person.

(a) Ammonium Carbonate (b) Ammonium Hydroxide
(c) Ammonium Sulphate (d) Ammonium Chloride

(xv) Down the group, electron affinity ?

(a) decreases (b) increases
(c) remains same (d) None of these

QUESTION 2.

(i) (a) Name a chloride which is soluble in excess of ammonium hydroxide.

(b) Ammonia cannot be collected over water. Give reasons.
(c) Pick the odd member from the list giving reasons : Ammonia, sulphur dioxide, hydrogen chloride,
carbon dioxide.
(d) Write balanced equation of the reaction in the preparation of ammonia from ammonium chloride. Give
two large-scale uses of ammonia.

(ii) Match the options A to E with the statements (i) to (v):

A alkynes (i) No. of molecules in 22.4 dm3 of carbon dioxide at S.T.P

B alkane (ii) An element with electronic configuration 2,8,8,3
C iron (iii) C n H 2n + 2
D 6.023 # 10 23
(iv) C n H 2n - 2
E metal (v) The metal that forms two types of ions

(iii) Complete the following by choosing the correct answers from the bracket:
(a) The energy required to remove an electron from a neutral isolated gaseous atom and convert it into a
positively charged gaseous ion is called_____(electron affinity, ionisation potential, electronegativity)
(b) The polar covalent compound in gaseous state that does not conduct electricity is______. (carbon
tetra chloride, ammonia, methane)
(c) Brass is an alloy of _____ (iron/copper) and Zinc.
(d) When hot concentrated sulphuric acid is added to sulphur, it gets oxidised to _______ (H2S/SO2)
(e) Density of Hydrogen chloride gas is _____ (greater/smaller) than that of air.

(iv) Identify the following:

(a) Electrode used as cathode in electro-refining of impure copper.
(b) Gas accumulated in cathodic limb when water is electrolysed.
(c) Impurities which remain behind at the bottom of the cell.
(d) An acid used in the electrolysis of water.
(e) Drying agent for Hydrogen chloride gas.

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(v) State the general formula of the homologous series to which each of the following belong :
(a) Methane
(b) Butane
(c) Butyne
(d) Ethyne
(e) Propyne

SECTION - B
(Attempt any four questions.)

QUESTION 3.

(i) What are the final products when acetylene (ethyne) adds to
(1) Iodine
(2) Chlorine ?

(ii) Distinguish between the following pair of compounds using test given within bracket :
Sodium nitrate and sodium sulphite (using dilute sulphuric acid)

(iii) Lithium, sodium and potassium were put in one group on the basis of their similar properties,
(a) What are those similar properties ?
(b) What is the common name of this group?

(iv) Name the following :

(a) Two bases which are not alkalis.
(b) A normal salt and an acid salt of the same acid.
(c) A salt insoluble in cold water but soluble in hot water.

QUESTION 4.

(i) Give the chemical formula of :

(a) Bauxite
(b) Cryolite

(ii) A gas of mass 32 g has a volume of 20 litres at S.T.P. Calculate the gram molecular weight of the gas.

(iii) (a) Name the ion other than ammonium ion formed when ammonia dissolves in water.
(b) Write the equations for the following reactions which result in the formation of ammonia.
(1) A mixture of ammonium chloride and slaked lime is heated.
(2) Aluminium nitride and water.

(iv) (a) Write balanced equation for the reaction of zinc and dilute hydrochloric acid.
(b) State what is observed when hydrochloric acid is added to silver nitrate solution.
(c) Name the compound which can be oxidised to chlorine.

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ICSE 10th Chemistry Sample Paper 06 Page 5

QUESTION 5.

(i) Explain why Ammonia gas is evolved when Water is added to the product formed when Magnesium is burnt
in the air.

(ii) What do you understand by an alkali ? Give two examples of (a) Strong alkalies (b) Weak alkalies.

(iii) A chemistry student is studying the electronic configurations of two elements, X [2, 8, 1] and Y [2, 8, 8, 2],
to understand their behavior during chemical reactions. The student needs to use this information to answer
the following questions:
(a) Element loses one electron from its outermost shell and acquires stable noble gas electronic configuration.
(b) Element _____ is an alkaline earth metal.
(c) Element _____ loses two electrons and attains +2 charge to acquires stable noble gas electronic
configuration.

(iv) Give three uses each of ethylene and acetylene.

QUESTION 6.

(i) What is the volume (in litres) at S.T.P. occupied by

(a) 6.023 # 1023 molecules of Sulphur dioxide?
(b) 12.046 # 1023 molecules of Sulphur trioxide?

(ii) (a) Write the ionisation of sulphuric acid showing the formation of hydronium ion.
(b) Give two examples of hygroscopic substances.

(iii) (a) What should be the physical state of Lead bromide if it is electrolysed?
(b) What particles are present in pure Lead bromide?
(c) Write the equations for the reactions which take place at the electrodes during the electrolysis of Lead
bromide.

(iv) (a) Zinc is______in the activity series than copper.

(b) Cations are______ions.
(c) Anions are______ions.

QUESTION 7.

(i) Write balanced chemical equations:

(a) Ethyl alcohol is dehydrated.
(b) Ethyl chloride reacts with aqueous Potassium hydroxide.
(c) Ethanol is oxidised with acidified Potassium dichromate.

(ii) Rahul is performing tests on three different solutions: Solution A (sodium hydroxide solution), Solution B
(a weak acid), and Solution C (dilute sulphuric acid). Based on the chemical behavior of these solutions,
Rahul needs to answer the following:
(a) Liberate sulphur dioxide from sodium sulphite.
(b) Give a white precipitate with zinc sulphate solution.
(c) Contain solute molecules and ions?

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(iii) What happens when (give balanced equation):

(a) Nitric acid is added to washing soda and the resulting gas is passed through a freshly prepared lime
water ?
(b) Limestone reacts with nitric acid ?
(c) Nitric acid (conc.) is heated with copper?
(d) Cupric oxide reacts with nitric acid ?

QUESTION 8.

(i) State your observations when ammonium hydroxide solution is added drop by drop and then in excess to
each of the following solutions :
(a) copper sulphate solution
(b) zinc sulphate solution

(ii) What is the essential difference in the nature of compounds when two combining atoms
(a) differ much in their electro-negativities ?
(b) don’t differ much in their electro-negativities?

(iii) Using sodium hydroxide solution, how would you distinguish between:
(a) Zinc nitrate solution and calcium nitrate solution.
(b) Iron(II) chloride and Iron(III) chloride.
(c) Lead hydroxide and magnesium hydroxide?

(iv) Following questions are pertaining to laboratory preparation.

(a) Name the acid used for the preparation of hydrogen chloride gas in the laboratory. Why is this particular
acid preferred over other acids?
(b) Reaction of hydrogen chloride gas when it comes in contact with ammonia.
(c) Write the balanced chemical equation to show the lab preparation of hydrochloric acid.

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ICSE 10th Chemistry Sample Paper 07 Page 1

Sample Paper 07
ICSE Class X 2024-25
Chemistry
Science Paper - 2
Time: 2 Hours Max. Marks: 80
General Instructions:
1. Answer to this Paper must be written on the paper provided separately.
2. You will not be allowed to write during first 15 minutes.
3. This time is to be spent in reading the question paper.
4. The time given at the head of this Paper is the time allowed for writing the answers.
5. Section A is compulsory. Attempt any four questions from Section B.

SECTION - A
(Attempt all questions from this Section.)

QUESTION 1.
Choose the correct answers to the questions from the given options.
(Do not copy the questions, write the correct answer only.)

(i) When fused lead bromide is electrolysed we observe :

(a) a silver grey deposit at anode and a reddish brown deposit at cathode
(b) a silver grey deposit at cathode and a reddish brown deposit at anode
(c) a silver grey deposit at cathode and reddish brown fumes at anode
(d) silver grey fumes at anode and reddish brown fumes at cathode

(ii) The metal oxide which can react with acid as well as alkali is :
(a) Silver oxide (b) Copper (II) oxide
(c) Aluminium oxide (d) Calcium oxide

(iii) Assertion (A): Group IA elements are called alkali metals because when their oxides and hydroxides are
treated with water, they produce alkaline solutions.
Reason (R): The oxides and hydroxides of alkali metals dissolve in water to form strong bases, which result
in highly alkaline solutions.
(a) Both A and R are true, and R is the correct explanation for A.
(b) Both A and R are true, but R is not the correct explanation for A.
(c) A is true, but R is false.
(d) A is false, but R is true.

(iv) Why zinc chloride is stored in air-tight bottles ?

(a) Because it is highly basic substance. (b) Because it is highly reactive substance.
(c) Because it is highly acidic substance. (d) Because it is a deliquescent substance.

(v) Aluminium oxide is :

(a) Amphoteric oxide (b) Acidic oxide
(c) Neutral oxide (d) Basic oxide

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(vi) The molecular mass of benzene is :

(a) 72 g (b) 28 g
(c) 78 g (d) 68 g

(vii) Match the column A with column B and choose the correct option:

Column A Column B
A. Acid salt (i) Ferrous ammonium sulphate.
B. Double salt (ii) Contains only ions.
C. Ammonium hydroxide solution (iii) Sodium hydrogen sulphate.

D. Dilute hydrochloric (iv) Contains only ions acid.

E. Carbon tetrachloride (v) Contains ions and molecules.
(a) B-i, C-iv, D-ii, E-iv (b) A-v, B-i, C-ii, D-iv, E-iii
(c) A-i, B-iv, C-ii, D-v, E-iii (d) A-ii, B-iv, C-i, D-v, E-iii

(viii) Which of the following is correct order for ionisation energy?

(a) N>O>F (b) N>O<F
(c) N<O<F (d) N<O>F

(ix) Assertion (A): Magnesium (Mg) reacts with very dilute nitric acid to evolve hydrogen gas.
Reason (R): Magnesium is a highly reactive metal that displaces hydrogen from very dilute nitric acid,
resulting in the evolution of hydrogen gas.
(a) Both A and R are true, and R is the correct explanation for A.
(b) Both A and R are true, but R is not the correct explanation for A.
(c) A is true, but R is false.
(d) A is false, but R is true.

(x) A student named Ravi is studying the elements of Period 2 in the periodic table. He is asked to identify the
element with the highest electron affinity from the following options:
(a) Lithium (b) Carbon
(c) Fluorine (d) Neon

(xi) Aqua regia is a mixture of:

(a) Dilute hydrochloric acid and concentrated nitric acid
(b) Concentrated hydrochloric acid and dilute nitric acid
(c) Concentrated hydrochloric acid [1 part] and concentrated nitric acid [3 parts]
(d) Concentrated hydrochloric acid [3 parts] and concentrated nitric acid [1 part]

(xii) The unsaturatd hydrocarbons undergo

(a) a substitution reaction (b) an addition reaction
(c) an oxidation reaction (d) None of these

(xiii) An example of weak alkali solution is ...............

(a) Sodium hydroxide (b) Nitrogen dioxide
(c) Potassium hydroxide (d) Ammonium hydroxide

(xiv) Lead hydroxide precipitates are in water.

(a) insoluble (b) soluble
(c) partially soluble (d) partially insoluble


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ICSE 10th Chemistry Sample Paper 07 Page 3

(xv) Which of the following elements will form an acidic oxide?

(a) An element with atomic number 19 (b) An element with atomic number 3
(c) An element with atomic number 12 (d) An element with atomic number 7

QUESTION 2.

(i) Ammonia is manufactured by Haber’s process.

(a) Under what conditions do the reactants combine to form ammonia ? Give a balanced equation for the
reaction.
(b) In what ratio by volume, are the above gases used ?
(c) State one possible source of each reactant used in Haber’s process.
(d) What is the function of :
(1) finely divided iron,
(2) molybdenum in the above process ?

(ii) Match the following:

Column-I Column-II
(i) Promoter used in Haber’s process (a) 800° C

(ii) Catalyst used in oxidation of ammonia (b) K2HgI4

(iii) Drying agent for ammonia (c) Molybdenum

(iv) A solution which gives brown colouration with ammonium salts (d) Refrigent

(v) Temperature in Haber’s process (e) Platinum

(iii) Complete the following by choosing the correct answers from the bracket:
(a) Elements of Group 1 are called ______ (alkali metals/non-alkali metals).
(b) As we descend the electrochemical series containing cations, the tendency of the cations to get ______
(oxidised/reduced) at the cathode increases.
(c) ______ (iodine/non-iodine) is a non-metal which sublimes on heating.
(d) The compound formed when ethanol reacts with sodium is ______ (sodium ethanoate, sodium
ethoxide, sodium propanoate).
(e) Hydrochloric acid can be converted into chlorine by heating with ______ (calcium oxide, lead (II)
oxide, lead (IV) oxide) which acts as a/an ______ (oxidising, reducing) agent.

(iv) Identify the following:

(a) Catalyst used during Contact process.
(b) An organic acid which on reaction with concentrated Sulphuric acid, produces two oxides of Carbon.
(c) The alkali metal in the third period.
(d) An alkaline earth metal in the third period.
(e) The number of shells in the third period.

(v) (a) Draw the structural formula for each of the following :
1. 2, 2 dimethyl pentane
2. methanol
3. Iso propane
(b) Write the IUPAC name for the following compounds :
1. acetaldehyde
2. acetylene


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SECTION - B
(Attempt any four questions.)
QUESTION 3.

(i) (a) Draw the structural formulae of the two isomers of butane. Give the correct IUPAC name of each
isomer.
(b) State one use of acetylene.

(ii) (a) HCl, HNO3 and H2SO4 are the formulae of three compounds.
Which of these compounds has the highest boiling point and which has the lowest?
(b) Dilute Hydrochloric acid and dilute Sulphuric acid are both colourless solutions. How will the addition
of Barium chloride solution to each help to distinguish between the two?

(iii) In Period 3 of the Periodic Table, a student named Sara is analyzing two elements, A and B, where element
B is placed to the left of element A. Based on their positions, Sara is asked to complete the following
statements by choosing the correct word from the brackets:
(a) The element B would have (lower/higher) metallic character than A.
(b) The element A would probably have (lesser/higher) electron affinity than B.
(c) The element A would have (greater/smaller) atomic size than B.

(iv) What do you observe when:

(a) Nitric acid is dropped over heated saw dust.
(b) Nitrogen dioxide is passed through acidified freshly prepared Ferrous sulphate solution.
(c) Concentrated Sulphuric acid is slowly added from the sides of the test-tube containing a solution of
Nitrate and equal volume of freshly prepared Ferrous sulphate solution.

QUESTION 4.

(i) (a) Name the compound added to pure alumina to lower the fusion temperature during the electrolytic
reduction of alumina.
(b) Write the equation for the reaction that occurs at the cathode during the extraction of aluminium by
electrolysis.

(ii) Molecular formula of a compound is C6H18O3. Find its empirical formula.

(iii) Give three reactions to show reducing property of ammonia.

(iv) Describe tests (other than electrolysis) to prove that hydrochloric acid contains :
(a) Hydrogen gas
(b) Chlorine gas

QUESTION 5.

(i) (a) Name the substance used for drying Ammonia.

(b) Write an equation to illustrate the reducing nature of Ammonia.
(ii) Carbonic acid gives an acid salt but hydrochloric acid does not. Explain.
(iii) An element X has atomic number 16. Answer the following questions.
(a) State the period and group to which X belongs?
(b) Is X a metal or a non-metal?
(c) What is the valency of X?


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ICSE 10th Chemistry Sample Paper 07 Page 5

(iv) During a chemistry experiment, a student named Riya is tasked with writing balanced chemical equations
for the following reactions. Help Riya by providing the correct balanced equations based on the reactions
mentioned below::
(a) Burning of ethane in plentiful supply of air.
(b) Action of water on Calcium carbide.
(c) Heating of Ethanol at 170°C in the presence of conc. Sulphuric acid.

QUESTION 6.

(i) In a laboratory experiment, a student named Arjun collects 2 litres of carbon dioxide, 3 litres of chlorine, 5
litres of hydrogen, 4 litres of nitrogen, and 1 litre of sulfur dioxide under the same conditions of temperature
and pressure. Based on this information, answer the following questions:
(a) In which gas sample will there be the greatest number of molecules?
(b) In which gas sample will there be the least number of molecules?
Justify your answer.

(ii) From the list of the following salts choose the salt, that most appropriately fits the description given in the
following :
[AgCl, MgCl2, NaHSO4, PbCO3, ZnCO3, KNO3, Ca(NO3)2]
(a) A deliquescent salt.
(b) An insoluble chloride.

(iii) The following questions refer to the electrolysis of copper sulphate solution with copper electrodes :
(a) Compare the change in mass of the cathode with the change in mass of anode.
(b) What happens to the colour of copper sulphate solution of platinum electrodes are used ? Explain with
observation.
(c) What is the practical application of the electrolysis of copper sulphate solution ? Briefly describe one
such application.

(iv) State the electrode reaction at the anode during the electrolysis of :
(a) Aqueous copper sulphate using platinum electrodes
(b) Acidified water
(c) Aqueous nickel sulphate solution using nickel anode

QUESTION 7.

(i) Identify the term or substance based on the descriptions given below :
(a) Hydrocarbon containing a triple bond used for welding purposes.
(b) The property by virtue of which the compound has the same molecular formula but different structural
formulae.

(c) The compound formed where two alkyl groups are linked by group.

(ii) The diagram given below is to prepare iron(III) chloride in the laboratory :

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(a) What is substance B ?

(b) What is the purpose of B ?
(c) Why is iron(III) chloride to be stored in a closed container?

(iii)

Group IA IIA IIIA IVA VA VIA VIIA 0

number 1 2 13 14 15 16 17 18
2nd period Li D O J Ne
A Mg E Si H M
R T I Q U Y
1. In this table H does not represent hydrogen.
2. Some elements are given in their own symbol and position in the periodic table.
3. While others are shown with a letter.
With reference to the table answer the following questions :
(a) Identify the most electronegative element.
(b) Identify the most reactive element of group 1.
(c) Identify the element from period 3 with least atomic size.
(d) How many valence electrons are present in Q?

QUESTION 8.

(i) Identify the cations in each of the following case :

(a) NaOH solution when added to the Solution (A) gives a reddish brown precipitate.
(b) NH4OH Solution when added to the Solution (B) gives white ppt. which does not dissolve in excess.

(ii) Why do atoms combine ?

(iii) Complete and balance the following equations:

(a) Na 2 SO 3 + H 2 SO 4 $ ......... + ......... + .........
(b) NaCl + H 2 SO 4 $ ......... + .........
(c) C 12 H 22 O 11 + H 2 SO 4 $ ......... + .........

(iv) State one relevant observation for each of the following reactions.
(a) Ammonium hydroxide solution is first added in a small quantity and then in excess to a solution of
copper sulphate.
(b) Sodium acetate is added to sodium hydroxide.
(c) Ammonia gas is passed over heated copper oxide.

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ICSE 10th Chemistry Sample Paper 08 Page 1

Sample Paper 08
ICSE Examination Class X 2024-25
Chemistry
Science Paper - 2
Time: 2 Hours Max. Marks: 80
General Instructions:
1. Answer to this Paper must be written on the paper provided separately.
2. You will not be allowed to write during first 15 minutes.
3. This time is to be spent in reading the question paper.
4. The time given at the head of this Paper is the time allowed for writing the answers.
5. Section A is compulsory. Attempt any four questions from Section B.

SECTION - A
(Attempt all questions from this Section.)

QUESTION 1.
Choose the correct answers to the questions from the given options.
(Do not copy the questions, write the correct answer only.)

(i) Which of the following statements is correct about an aqueous solution of an acid and of a base?
(i) Higher the pH, stronger the acid
(ii) Higher the pH, weaker the acid
(iii) Lower the pH, stronger the base
(iv) Lower the pH, weaker the base
(a) (i) and (iii) (b) (ii) and (iii)
(c) (ii) and (iv) (d) (i) and (iv)

(ii) Identify one statement that holds true for electrolysis of molten lead bromide.
(a) Silver grey metal deposits at the anode.
(b) Temperature is not maintained during electrolysis.
(c) Brown vapours of bromine are obtained at the anode.
(d) Electrolyte contains H+ ions along with Pb2+ ions.

(iii) Assertion: Calcium starts floating when added in water.

Reason: Calcium starts floating because the bubbles of oxygen gas which are formed during the reaction
stick to the surface of the metal.
(a) Assertion and Reason both are correct statements and reason is the correct explanation of the assertion.
(b) Assertion and Reason both are correct statements, but reason is not the correct explanation of the
assertion.
(c) Assertion is false, but reason is true.
(d) Assertion is true, but reason is false.
(iv) In a periodic table, the element of period 3 are arranged in the increasing order of ionisation potentialas
(a) B, N,Cl, Ar (b) Mg, Si, S, Ar
(c) Ar, Si, S, Mg (d) Si, Ar, Cl, Mg
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(v) Assertion : Metalloids are present in zig-zag rows in periodic table.

Reason : Metalloids have same properties.
(a) Assertion and reason both are correct statements, but reason is not the correct explanation of the
assertion.
(b) Assertion and reason both are correct statements and reason is the correct explanation of the assertion.
(c) Assertion is true, but reason is false.
(d) Assertion is false, but reason is true

(vi) Which of the following is a weak electrolyte ?

(a) Sodium chloride (b) Benzene
(c) Sodium acetate (d) Ammonium acetate

(vii) 10-6 M HCl is divided to 100 times its pH will be

(a) 6.0 (b) 8.0
(c) 9.5 (d) 6.95

(viii) The electron affinity of Be is similar to

(a) Na (b) B
(c) Li (d) He

(ix) Nitric acid was also known as :

(a) aqua fortis (b) aqua guard
(c) aqua hydroxide (d) aqua nitrate

(x) An element X has an atomic number 15. With which of the following elements will it show similar chemical
properties?
(a) N (7) (b) Ne (10)
(c) O (8) (d) Be (4)

(xi) Nitric acid turns orange coloured methyl orange.

(a) Red (b) Orange
(c) Pink (d) Blue

(xii) Heating sodium acetate with soda lime produces :

(a) Ethane (b) Methane
(c) Ethene (d) Ethyne

(xiii) The colour of the precipitate formed after the addition of a small amount of sodium hydroxide solution to
an aqueous solution of ferric chloride is
(a) gelatinous white (b) pale blue
(c) reddish brown (d) dirty green

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(xiv) Ammonia is manufactured by the Haber’s process using iron catalyst. Which of the following statements is
incorrect?
(a) Nitrogen is reduced by hydrogen
(b) It is not possible to obtain a 100% yield of ammonia
(c) The iron catalyst is used to increase the speed of the reaction.
(d) A higher temperature will increase the yield of ammonia

(xv) A student takes strips of iron (Fe), magnesium (Mg), copper (Cu), and zinc (Zn), separately in four test
tubes labeled I, II, III, and IV respectively. He adds 10 ml of dilute hydrochloric acid (HCl) to each test
tube and observes the gas evolved and the nature of the reaction.

He would observe the most vigorous reaction in the test tubes:

(a) I and II (b) II and IV
(c) III and IV (d) I and III

QUESTION 2.

(i) The diagram shows an experimental set up for the laboratory preparation of a pungent smelling gas. The
gas is alkaline in nature.

(a) Name the gas collected in the jar.

(b) Write the balanced equation for the above preparation.
(c) How is the gas being collected ?
(d) Name the drying agent used.
(e) How will you find that the jar is full of gas ?

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(ii) Match the following Column-I with Column-II:

Column-I Column-II
(i) Sulphur dioxide (a) Sulphuric acid

(ii) Oil of vitriol (b) Burning sulphur smell

(iii) Oleum (c) Rotten egg smell

(iv) Sulphur trioxide (d) Pyrosulphuric acid

(v) Hydrogen sulphide (e) Anhydride of sulphuric acid.

(iii) Complete the following by choosing the correct answers from the bracket:
(a) Across a period, the ionisation potential_____. (increases, decreases, remains same).
(b) A salt prepared by displacement reaction is_____. (ferric chloride, ferrous chloride, silver chloride)
(c) Aluminium powder, a constituent of paints, prevents_______. (heat radiation/formation of rust/
conduction of electric current).
(d) The black colour disappears learning a ----------- solution when adding sulphuric acid to copper oxide.
(e) When sodium chloride is heated with concentrated sulphuric acid below 200°C, one of the products
formed is______. (sodium hydrogen sulphate/sodium sulphate/ chlorine)

(iv) Identify the following:

(a) The amount of energy released when an atom in the gaseous state accepts an electron to form an anion.
(b) The alkali metal in the third period.
(c) The elements present in the first period.
(d) An element having highest electro-negativity.
(e) The noble gas with duplet arrangement of electrons.

(v) (a) Draw the structural formula for each of the following :
1. 2, 2 dimethyl pentane
2. methanol
3. Iso propane
(b) Write the IUPAC name for the following compounds :
1. acetaldehyde
2. acetylene

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SECTION - B
(Attempt any four questions.)

QUESTION 3.

(i) Write the molecular formulae of the third and fifth members of homologous series of carbon compounds
represented by the generally formula C n H 2n - 2 .

(ii) Write a balanced chemical equation for each of the following reactions :
(a) Action of dilute sulphuric acid on sodium hydroxide.
(b) Action of dilute sulphuric acid on zinc sulphide.

(iii) The following table represents a part of the periodic table.

Li Be B C N O F
Na Mg Al Si P S Cl
K Br
From these elements, answer the following:
(a) Which is the element having biggest atomic size ?
(b) Which element has the highest ionisation energy?
(c) Which elements constitute alkali metals?

(iv) (a) Outline the steps necessary to convert insoluble lead (II) oxide into soluble lead (II) chloride.
(b) If iron reacts with dilute sulphuric acid, what will be the products ?
(c) A solution of iron (III) chloride has a pH less than 7. Is the solution acidic or alkaline ?

QUESTION 4.

(i) Why are cryolite and fluorspar added to pure alumina ?

(ii) Calculate the volume of oxygen required for the complete combustion of 8.8 g of propane (C3H8)
(Atomic mass: H = 1, C = 12, O = 16).

(iii) (a) Write the balanced chemical equation to prepare ammonia gas in the laboratory by using an alkali.
(b) State why concentrated sulphuric acid is not used for drying ammonia gas.
(c) Why is ammonia gas not collected over water?

(iv) Distinguish between the following pairs of compounds using the test given within brackets:
(a) Iron (II) sulphate and iron (III) sulphate (using ammonium hydroxide)
(b) A lead salt and a zinc salt (using excess ammonium hydroxide)

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QUESTION 5.

(i) Write down the equations for following reactions :

(a) When ammonium chloride is warmed with sodium hydroxide solution.
(b) When ammonium chloride is warmed with concentrated sulphuric acid.

(ii) (a) Classify the solutions of the following as acids, bases or salts : Ammonium hydroxide, barium chloride,
sodium chloride, sodium hydroxide, H2SO4 and HNO3.
(b) Explain how a reagent chosen from those above enables you to distinguish between the two acids
mentioned therein.

(iii) A farmer uses a chemical compound containing an element X, which has an atomic number of 16, to enhance
the quality of soil for crop growth. He wants to understand the nature of the element to determine its
potential impact on plant health.
(a) State the period and group to which X belongs?
(b) Is X a metal or a non-metal?
(c) What is the valency of X?

(iv) (a) What is the type of reaction taking place between ethane and chlorine to form monochloroethane ?
(b) The reaction between ethene and chlorine forms only one product. Name the type of this reaction.
(c) (1) Draw the structural formula of ethene.
(2) What is the feature of the ethene structure which allows ethene to react with chlorine in the way it
does ?

QUESTION 6.

(i) State :
(a) Gay Lussac’s law of gaseous volumes
(b) Avogadro’s law.

(ii) From the list of the following salts choose the salt, that most appropriately fits the description given in the
following :
[AgCl, MgCl2, NaHSO4, PbCO3, ZnCO3, KNO3, Ca(NO3)2]
(a) A deliquescent salt.
(b) An insoluble chloride.

(iii) A jeweler is refining copper to make high-quality copper wires for electrical purposes. He decides to electrolyze
copper sulfate solution using copper electrodes in his refining process. The diagram below represents the
electrolytic cell setup used in his workshop.:

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ICSE 10th Chemistry Sample Paper 08 Page 7

(a) Which electrode to your left or right is known as the oxidizing electrode and why?
(b) Write the equation representing the reaction that occurs.
(c) State two appropriate observations for the above electrolysis reaction.

(iv) (a) The metal plate through which current enters into an electrolyte is called______and it has_____
of electrons.
(b) The metal plate through which current leaves from an electrolyte is called______and it has______
of electrons.
(c) The ions which discharge on the negative electrode during electrolysis______electrons. Thus the ions
are said to be______.

QUESTION 7.

(i) Name the following:

(a) Process by which ethane is obtained from ethene.
(b) A hydrocarbon which contributes towards the green house effect.
(c) Distinctive reaction that takes place when ethanol is treated with acetic acid.

(ii) The pH values of three solutions A, B and C are given in the table. Answer the following questions:

Solution pH value

A 12

B 2

C 7

(a) Which solution will have no effect on litmus solution ?

(b) Which solution will liberate CO2 when reacted with sodium carbonate?
(c) Which solution will turn red litmus solution blue ?

(iii) (a) (1) Give two large-scale uses of nitric acid.

(2) A sample contains nitric oxide. The nitric oxide can be removed by passing the mixture through
solution ‘S’. Name the solution ‘S’.
(3) Nitrogen can be obtained in pure state by heating a mixture of ammonium chloride and a substance
X. Name the substance X.
(b) Nitrogen dioxide is called mixed anhydride. Explain.

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QUESTION 8.

(i) Write the equation for each of the following reactions :

(a) Sulphur is heated with concentrated sulphuric acid.
(b) Ammonium chloride is heated with sodium hydroxide.

(ii) (a) Name two compounds that are covalent when taken pure but produce ions when dissolved in water.
(b) For each compound, give the formulae of the ions formed in aqueous solutions.

(iii) Give one test each to distinguish between the following pairs of chemicals :
(a) Zinc nitrate solution and calcium nitrate solution.
(b) Sodium nitrate solution and sodium chloride solution.
(c) Iron (III) chloride solution and copper chloride solution.

(iv) State one relevant observation for each of the following reactions.
(a) Ammonium hydroxide solution is first added in a small quantity and then in excess to a solution of
copper sulphate.
(b) Sodium acetate is added to sodium hydroxide.
(c) Ammonia gas is passed over heated copper oxide.

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ICSE 10th Chemistry Sample Paper 09 Page 1

Sample Paper 09
ICSE Class X 2024-25
Chemistry
Science Paper - 2
Time: 2 Hours Max. Marks: 80
General Instructions:
1. Answer to this Paper must be written on the paper provided separately.
2. You will not be allowed to write during first 15 minutes.
3. This time is to be spent in reading the question paper.
4. The time given at the head of this Paper is the time allowed for writing the answers.
5. Section A is compulsory. Attempt any four questions from Section B.

SECTION - A
(Attempt all questions from this Section.)

QUESTION 1.
Choose the correct answers to the questions from the given options.
(Do not copy the questions, write the correct answer only.)

(i) The particles present in strong electrolytes are:

(a) only molecules (b) mainly ions
(c) ions and molecules (d) only atoms

(ii) An organic weak acid is :

(a) Formic acid (b) Sulphuric acid
(c) Nitric acid (d) Hydrochloric acid

(iii) Assertion (A): Calcium is an alkaline earth metal.

Reason (R): Alkaline earth metals are located in Group 2 of the periodic table and have two valence
electrons.
(a) Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion (A).
(b) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion
(A).
(c) Assertion (A) is true, but Reason (R) is false.
(d) Assertion (A) is false, but Reason (R) is true.

(iv) The acid anhydride of sulphuric acid is :

(a) Sulphur trioxide (b) Sulphur dioxide
(c) Sulphur monochloride (d) None of these.

(v) The tendency of an atom to attract shared pair of electrons to itself when combined in a compound is called
.......... along the period.
(a) electro-positivity (b) electro-negativity
(c) inert (d) none of the above
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(vi) Twice of vapour density gives us :

(a) Actual vapour density (b) Relative vapour density
(c) Molar volume (d) Molecular mass

(vii) Which gas is evolved when HNO3 react with sodium bicarbonate?
(a) H 2 (b) SO 2
(c) CO 2 (d) H 2 S

(viii) The electronic configuration of an element T is 2, 8,7. What is the group number of T ?
(a) Group 1 (b) Group 18
(c) Group 17 (d) Group 2

(ix) Concentration of nitric acid obtained in Ostwald’s process.

(a) 10% (b) 5%
(c) 15% (d) 20%

(x) A chemistry student, Aman, is analyzing the properties of an element labeled “A” based on its position in
the periodic table. Aman knows that the element belongs to Period 3 and Group II. Using this information,
Aman needs to answer the following:
If an element A belongs to Period 3 and Group II, then it will have :
(a) 2 shells and 3 valence electrons (b) 3 shells and 2 valence electrons
(c) 3 shells and 3 valence electrons (d) 2 shells and 2 valence electrons

(xi) The brown ring test is used for detection of

(a) CO 32- (b) NO 3-

(c) SO 32- (d) CI-

(xii) Assertion (A): Formic acid is used as a coagulating agent in the rubber industry.
Reason (R): Formic acid is efficient in causing latex to coagulate, which is an essential process in rubber
production.
(a) Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion
(A).
(b) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion
(A).
(c) Assertion (A) is true, but Reason (R) is false.
(d) Assertion (A) is false, but Reason (R) is true.

(xiii) The oxide and hydroxide of which metal is amphoteric :

(a) Iron (b) Copper
(c) Zinc (d) Manganese

(xiv) Unreacted gases are circulated back to compression pump through .......... .
(a) Desiccator (b) Boiler
(c) Compressor (d) Condenser

(xv) To decrease the chemical reactivity, alkali metals are converted to

(a) Amalgams (b) Chlorides
(c) Oxides (d) Nitrates

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QUESTION 2.

(i) (a) From the gases : ammonia, hydrogen chloride, hydrogen sulphide, sulphur dioxide, select the following :
(1) When this gas is bubbled through copper sulphate solution, a deep blue coloured solution is formed.
(2) This gas burns in oxygen with a greenish yellow flame.
(b) Write the equation for the reaction in the Haber’s process that forms ammonia.
(c) State the purpose of liquefying the ammonia produced in the process.
(d) State one reason why tap water is not used to prepare a solution of silver nitrate in the laboratory.

(ii) Match the column A with column B:

Column A Column B
(i) Ferric chloride (a) Precipitation
(ii) Sodium chloride (b) Simple displacement
(iii) Magnesium sulphate (c) Metal oxide and dilute acid
(iv) Lead chloride (d) Synthesis
(v) Copper sulphate (e) Neutralisation

(iii) Complete the following by choosing the correct answers from the bracket:
(a) In going across a period from left to right in a periodic table, the atomic size of the atoms _____.
(b) A molecule of _____ contains a triple bond. (hydrogen, ammonia, nitrogen)
(c) During termite welding _____ acts as a reducing agent.
(d) Converting ethanol to ethene requires the use of _____ (conc. HCl, conc. HNO3, conc. H2SO4).
(e) Addition of _____ (sodium nitrate, zinc nitrate, silver nitrate) to hydrochloric acid, gives an insoluble
precipitate of the respective chloride. The precipitate is _____ (soluble, insoluble) in ammonium
hydroxide and _____ (soluble, insoluble) in dilute nitric acid.

(iv) Identify the following:

(a) The fertilizer formed when Carbon dioxide is reacted with Ammonia.
(b) The solution which turns brown when it comes in contact with Ammonia.
(c) Catalyst used during Haber’s process.
(d) The catalyst used to oxidise ammonia.
(e) Name two metals which react with very dilute nitric acid.

(v) (a) Give the general formula of paraffins, olefins and alkynes.
(b) Name the hydrocarbon which is a : (1) tetra-hedral molecule, (2) planar molecule, (3) linear molecule,
(4) forms of a red precipitate with ammoniacal solution of copper (I) chloride.

SECTION - B
(Attempt any four questions.)

QUESTION 3.

(i) Define isomers. Write the various isomers of pentane. Write both molecular as well as structural formula
[Common and IUPAC names both].

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(ii) Name the gas in each of the following :

(a) A gas which turns acidified potassium dichromate clear green.
(b) The gas produced on reaction of dilute sulphuric acid with a metallic sulphide.

(iii) The following table represent the elements and the atomic number.

Element Atomic number

P 13
Q 7
R 10
With reference to this answer the following using only the alphabets given in the table.
(a) Which element combines with hydrogen to form a basic gas ?
(b) Which element has an electron affinity zero ?
(c) Name the element, which forms an ionic compound with chlorine.

(iv) Give one example of each one of the following:

(a) A nitrate of metal which on heating does not give nitrogen dioxide.
(b) A nitrate which on heating leaves no residue behind.
(c) A metal nitrate which on heating is changed into metal oxide.
Also give equations in each case.

QUESTION 4.

(i) Answer the following questions :

(a) Name the process used for the enrichment of sulphide ore.
(b) Write the chemical formulae of one main ore of iron and aluminium.

(ii) A gaseous hydrocarbon contains 82.76% of carbon. Given that its vapour density is 29, find its molecular
formula. [C = 12, H = 1]

(iii) How will you demonstrate the solubility of ammonia in water ? Explain.

(iv) Aman, a chemistry student, is tasked with preparing hydrochloric acid (HCl) gas in the laboratory and
dissolving it in water. Aman needs to follow specific steps and answer the following based on the experiment.
In the laboratory preparation of hydrochloric acid, HCl gas is dissolved in water.
(a) Draw a diagram to show the arrangement used for the absorption of HCl in water.
(b) Why is such an arrangement necessary ? Give two reasons.
(c) Write the chemical equations for the laboratory preparation of HCl gas when the reactants is below 200
°C.

QUESTION 5.

(i) (a) State what will you observe when ammonium hydroxide solution is added to copper sulphate in excess.
Give balanced equation.
(b) Complete and balance the following equation:
CuO(Heat) + NH3 $

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ICSE 10th Chemistry Sample Paper 09 Page 5

(ii) Write the equations for the laboratory preparation of the following salts using sulphuric acid :
(a) Iron (II) sulphate from iron
(b) Sodium sulphate from sodium carbonate

(iii) During the process of electrolysis of given compound. State your observations.
(a) Fused lead bromide using graphite electrodes.
(b) Copper sulphate solution using copper electrodes.
(c) Copper (II) sulphate solution using platinum as cathode and carbon as anode.

(iv) Give balance chemical equation for the following conversions:

(a) Ethanoic acid to ethyl ethanoate.
(b) Calcium carbide to ethyne.
(c) Sodium ethanoate to methane.

QUESTION 6.

(i) How will you calculate percentage of an element in a compound ?

(ii) Suresh, a chemistry student, has prepared an acidic solution labeled “X” with a pH of 5. He is now asked
to predict how the pH of solution X will change under the following conditions.
Suresh prepared an acidic solution X that has a pH of 5. How will the pH of solution X change on addition
of the following?
(1) Hydrochloric acid
(2) a solution of base ?

(iii) Name all the particles present in

(a) Sodium chloride solution
(b) Molten Sodium chloride
(c) Sulphurous acid

(iv) (a) What is meant by the term electrolyte?

(b) What are the particles present in a compound which is a non-electrolyte?
(c) If an electrolyte is described as a strong electrolyte, what does this mean?

QUESTION 7.

(i) What happens when (give balanced equations) :

(a) Ethylene is burnt in an excess of oxygen.
(b) Ethylene reacts with chlorine.
(c) Ethylene combines with hydrogen chloride.

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(ii) For each of the conversions A , B , C , D and E in the scheme below, state how the conversions can be
carried out.

(iii) (a) When nitric acid is prepared by the action of concentrated sulphuric acid on potassium nitrate, what is
the special feature of the apparatus used?
(b) Write the equation for the laboratory preparation of nitric acid from potassium nitrate and concentrated
sulphuric acid.
(c) Potassium nitrate is prepared from potassium hydroxide and nitric acid. Name the type of this reaction.
(d) Which gas is produced when potassium nitrate is heated ? Write the equation for the reaction.

QUESTION 8.

(i) State one relevant observation for the following reaction :

Addition of excess ammonium hydroxide into copper sulphate solution.

(ii) Writ down the difference between sodium atom and sodium ion.

(iii) Explain the following :

(a) In the manufacture of sulphuric acid by the Contact Process, great care is taken to purify the mixture
of air and sulphur dioxide, especially to free it from arsenic impurities.
(b) Whenever water is added to concentrated sulphuric acid or concentrated sulphuric acid is added to
water, a large amount of heat is liberated. But the acid dangerously spurts out only when water is added
to the concentrated acid.

(iv) Choose the correct word which refers to the process of electrolysis from P to R, to match the description 1
to 3.
P : Oxidation Q : Cathode R : An electrolyte
(1) Conducts electricity in aqueous or in molten state.
(2) Loss of electron takes place at anode.
(3) A reducing electrode.

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ICSE 10th Chemistry Sample Paper 10 Page 1

Sample Paper 10
ICSE Examination Class X 2024-25
Chemistry
Science Paper - 2
Time: 2 Hours Max. Marks: 80
General Instructions:
1. Answer to this Paper must be written on the paper provided separately.
2. You will not be allowed to write during first 15 minutes.
3. This time is to be spent in reading the question paper.
4. The time given at the head of this Paper is the time allowed for writing the answers.
5. Section A is compulsory. Attempt any four questions from Section B.

SECTION - A
(Attempt all questions from this Section.)

QUESTION 1.
Choose the correct answers to the questions from the given options.
(Do not copy the questions, write the correct answer only.)

(i) Which of the following ions will readily discharge at the anode during the electrolysis of acidulated water?
(a) OH- (b) SO24-

(c) Cl- (d) H+

(ii) NaHSO3 is an example of which type of salts?

(a) Complex salts (b) Basic salts
(c) Normal salts (d) Acidic salts

(iii) Alkaline earth metals have the same

(a) number of valence electrons (b) number of shells
(c) metallic property (d) ionisation potential

(iv) Vinegar contains ............... acid.

(a) Phenol (b) Hydrochloric
(c) Sulphuric (d) Acetic

(v) Which of the following properties do not match with elements of the halogen family?
(a) They have seven electrons in their valence shell.
(b) They are metallic in nature.
(c) They are highly chemically reactive.
(d) They are diatomic in their molecular form.

(vi) During electrolysis of sodium chloride the gas released at anode is :

(a) Chlorine (b) Hydrogen
(c) Oxygen (d) None of these

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(vii) Assertion: Tap water conducts electricity but distill water does not conducts electricity.
Reason: Tap water conducts electricity as it contains ions whereas distilled water does not contain ions.
(a) Assertion is false, but reason is true.
(b) Assertion and Reason both are correct statements, but reason is not the correct explanation of the
assertion.
(c) Assertion is true, but reason is false.
(d) Assertion and Reason both are correct statements and reason is the correct explanation of the assertion.

(viii) Across a period, the ionization potential ...............

(a) decreases (b) increases
(c) remains the same (d) none of the above

(ix) Which acid is used for brown ring test ?

(a) Sulphuric acid (b) Carbonic acid
(c) Hydrochloric acid (d) Sulphurous acid

(x) Elements in a period, all have the same number of ............... in their atoms.
(a) electron shells (b) valence electrons
(c) valency (d) None of the above

(xi) How many lone pair(s) involved in the formation of coordinate bond(s) in nitric acid?
(a) 4 (b) 2
(c) 3 (d) 1

(xii) If relative molecular mass of butane (C4H10) is, 58 then its vapour density will be
(a) 58 (b) 29
(c) 32 (d) 16

(xiii) Assertion : The ionization energy of Mg is more than sodium.

Reason : The ionization energy decreases in a period from left to right.
(a) Assertion and reason both are correct statements and reason is the correct explanation of the assertion.
(b) Assertion and reason both are correct statements, but reason is not the correct explanation of the
assertion.
(c) Assertion is true, but reason is false.
(d) Assertion is false, but reason is true

(xiv) The ratio by volume of Nitrogen and Hydrogen in Haber’s process is

(a) 1 : 3 (b) 4 : 2
(c) 3 : 1 (d) 2 : 4

(xv) In a group, the larger the atomic size of an element, the ............... metallic is the element.
(a) more (b) same
(c) less (d) more or less

QUESTION 2.
(i) (a) State what do you observe when : neutral litmus solution is added to an alkaline solution.
(b) Name (formula is not acceptable) the gas produced in the following reaction :
Warming ammonium sulphate with sodium hydroxide solution.
(c) Write the equation for :
the preparation of ammonia from ammonium chloride and calcium hydroxide.
(d) What are the products formed when ammonia is oxidised with copper oxide? Also give the balanced
equation.

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ICSE 10th Chemistry Sample Paper 10 Page 3

(ii) Match the following column A with Column B:

Column A Column B

A. Acid salt (i) Sodium potassium carbonate

B. Mixed salt (ii) Alum

C. Complex salt (iii) Sodium carbonate

D. Double salt (iv) Sodium zincate

E. Normal salt (v) Sodium hydrogen carbonate

(iii) Complete the following by choosing the correct answers from the bracket:
(a) In Period 3, the most metallic element is______. (sodium/magnesium/aluminium)
(b) The basicity of Acetic Acid is_____(3, 1, 4)
(c) Transmission wires are made of aluminium, since aluminium is______. (corrosion resistant/a good
conductor of heat/a good conductor of electricity).
(d) Addition of sulphuric acid to zinc sulphide flakes release a gas With ----------- small.
(e) Quick lime is not used to dry HCl gas because it is _____ (alkaline, acidic, neutral)

(iv) Identify the following:

(a) The tendency of an atom to attract electrons towards itself when combined in a covalent compound.
(b) The number of shells in the third period.
(c) The most electronegative element in the third period.
(d) A non-metal which has three electrons in the outermost shell.
(e) The gas evolved on reaction of aluminium with boiling concentrated caustic alkali solution.

(v) (a) Distinguish between the saturated hydrocarbon ethane and the unsaturated hydrocarbon ethene by
drawing their structural formulae.
(b) Addition reactions and substitution reactions are type of organic reactions. Which type of reaction is
shown by :
(1) ethane
(2) ethene
(c) Write the equation for the complete combustion of ethane.
(d) (1) Why is pure acetic acid known as glacial acetic acid ?
(2) What type of compound is formed by the reaction between acetic acid and an alcohol ?

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SECTION - B
(Attempt any four questions.)

QUESTION 3.

(i) What is the molecular formula of alcohol, which is derived from pentane ?

(ii) What property of sulphuric acid is shown by the reactant of concentrated sulphuric acid when heated with
(a) Potassium nitrate
(b) Carbon

(iii) Consider the following elements :

Ca, O, Ar, S, Be, He
Which of the above elements would you expect to be
(a) very stable.
(b) in group IIA of the periodic table.
(c) in group VIA of the periodic table.

(iv) Sulphuric acid can be used to prepare a number of gases in the laboratory. Write balanced equations for
reactions in which the following gases are obtained using dilute sulphuric acid as one of the reactants.
(a) Hydrogen
(b) Carbon dioxide
(c) Sulphur dioxide

QUESTION 4.

(i) The following questions are related to Iron:

(a) Name the acid with which iron is rendered passive.
(b) Name an alloy of Iron and Carbon.

(ii) Determine the empirical formula of the compound whose composition by mass is : 42% nitrogen, 48%
oxygen and 9% hydrogen.
[H = 1, N = 14, O = 16]

(iii) (a) Name the substance used for drying ammonia.

(b) Write an equation to illustrate the reducing nature of ammonia.
(c) With reference to Haber’s process for the preparation for ammonia, write the equation and the condition
required.

(iv) Name the gas evolved when the following mixtures are heated:
(a) Calcium hydroxide and Ammonium Chloride.
(b) Sodium Nitrite and Ammonium Chloride.
(c) This gas is used as a reducing agent in reducing copper oxide to copper.

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ICSE 10th Chemistry Sample Paper 10 Page 5

QUESTION 5.

(i) Give four uses of ammonia.

(ii) Choose the most appropriate answer from the following list of oxides which fit the description. Each answer
may be used only once :
[SO2, SiO2, Al2O3, MgO, CO, Na2O]
(a) A basic oxide.
(b) An oxide which dissolves in water forming an acid.
(c) An amphoteric oxide.
(d) A covalent oxide of a metalloid.

(iii) Explain the following.

(a) Dilute nitric acid is generally considered a typical acid except for its reaction with metals.
(b) The reaction of dilute nitric acid with copper.
(c) The yellow colour that appears in concentrated nitric acid when it is left standing in an ordinary glass
bottle.

(iv) Write the formulae of the products in the following reactions :

(a) reaction of sodium with ethanol;
(b) reaction of alkaline potassium permagnate solution with ethanol;
(c) reaction of chromic anhydride with ethanol.

QUESTION 6.

(i) What is the mass in grams of 1 mole of

(a) Hydrogen gas (H2)
(b) Ammonia gas (NH3)

(ii) (a) State your observation with an equation on mixing a solution of CaCl2 with a solution of Na2CO3.
(b) Give the name and formula of acid salt which gives sodium ions and sulphate ions.

(iii) Electroplating is a practical method used to protect objects from corrosion and improve their appearance.
Mr. Ramu intends to electroplate his keychain with nickel to prevent rusting, which involves using specific
components for the process. :
(a) Name the electrolyte.
(b) Name the cathode.
(c) Name the anode.

(iv) Write down the words or phrases from the brackets that will correctly fill in the blanks in the following
sentences :
(a) Pure water consists almost entirely of_____ (ions/molecules).
(b) We can expect that pure water_____(will/will not) normally conduct electricity.
(c) The anode used in extraction of aluminium is______. [carbon rods/gas carbon/platinum]

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QUESTION 7.

(i) Write balanced chemical equations:

(a) Burning of Ethene in sufficient supply of air or Oxygen.
(b) Burning of Ethyne in sufficient supply of air or Oxygen.
(c) Calcium carbide is reacted with water.

(ii) Solution A is a sodium hydroxide solution. Solution B is a weak acid. Solution C is dilute sulphuric acid.
Which solution will ?
(a) liberate sulphur dioxide from sodium sulphite.
(b) give a white precipitate with zinc sulphate solution.
(c) contain solute molecules and ions.

(iii) (a) Write a balanced equation for the reaction of sulphur with hot concentrated nitric acid.
(b) Write the equation for the reaction of dilute nitric acid with copper.
(c) Account for the yellow colour that appears when concentrated nitric acid is left standing in an ordinary
glass bottle.
(d) Dilute nitric acid is considered a typical acid except for its reaction with metals. In what way is dilute
nitric acid different from other acids when it reacts with metals ?

QUESTION 8.

(i) State one observation for each of the following:

(a) Excess ammonium hydroxide solution is added to lead nitrate solution.
(b) Sodium hydroxide solution is added to ferric chloride solution at first a little and then in excess.

(ii) Draw an electron dot diagram to show the structure of hydroponic ion. State the type of bonding present
in it.

(iii) Give a chemical test to distinguish between the following pairs of chemicals:
(a) Lead nitrate solution and Zinc nitrate solution.
(b) Sodium chloride solution and Sodium nitrate solution.

(iv) Element X is a metal with a valency of 2, Y is a non-metal with a valency of 3.

(a) Write an equation to show how Y forms an ion?
(b) If Y is a diatomic gas, write an equation for the direct combination of X and Y to form a compound.
(c) To which group does this metal X belongs to?

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ICSE 10th Chemistry Sample Paper 11 Page 1

Sample Paper 11
ICSE Class X 2024-25
Chemistry
Science Paper - 2
Time: 2 Hours Max. Marks: 80
General Instructions:
1. Answer to this Paper must be written on the paper provided separately.
2. You will not be allowed to write during first 15 minutes.
3. This time is to be spent in reading the question paper.
4. The time given at the head of this Paper is the time allowed for writing the answers.
5. Section A is compulsory. Attempt any four questions from Section B.

SECTION - A
(Attempt all questions from this Section.)

QUESTION 1.
Choose the correct answers to the questions from the given options.
(Do not copy the questions, write the correct answer only.)

(i) The electrolyte used for electroplating an article with silver is :

(a) silver nitrate solution (b) silver cyanide solution
(c) sodium argentocyanide solution (d) nickel sulphate solution

(ii) Which one of the following will not produce an acid when made to react with water ?
(a) Carbon monoxide (b) Carbon dioxide
(c) Nitrogen dioxide (d) Sulphur trioxide

(iii) Assertion (A): Transition elements show variable valency.

Reason (R): Transition elements and f-block elements can lose different numbers of electrons from their d
or f orbitals, leading to variable oxidation states.
(a) Both A and R are true, and R is the correct explanation for A.
(b) Both A and R are true, but R is not the correct explanation for A.
(c) A is true, but R is false.
(d) A is false, but R is true.

(iv) Carbonic acid is a dibasic acid. Why ?

(a) Because it has double electron at its valence cell
(b) Because it has two replaceable hydrogen atoms
(c) Both (a) and (b) are correct
(d) None of the above

(v) Assertion (A): Group IIA elements are known as alkaline earth metals.
Reason (R): These elements form basic (alkaline) solutions when combined with water and are found in the
earth’s crust.

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(a) Both A and R are true, and R is the correct explanation for A.
(b) Both A and R are true, but R is not the correct explanation for A.
(c) A is true, but R is false.
(d) A is false, but R is true.

(vi) The ratio between the number of molecules in 2 g of hydrogen and 32 g of oxygen is:
[Given that H = 1, O = 16]
(a) 1 : 2 (b) 1 : 0.01
(c) 1 : 1 (d) 0.01 : 1

(vii) The salt which in solution gives a pale green precipitate with sodium hydroxide solution and a white
precipitate with barium chloride solution is:
(a) Iron (II) sulphate (b) Iron (III) sulphate
(c) Iron (II) chloride (d) Iron (III) chloride

(viii) Among the following, the atom of smallest radius is

(a) Na (b) K
(c) Li (d) Br

(ix) Commercial and common name of tri nitroglycerine is.

(a) Aqua Regia (b) T.N.T.
(c) Dynamite (d) Nitrosyl Chlorid

(x) Inner transition elements comprise of .......... block.

(a) c (b) d
(c) f (d) e

(xi) In the given equation, identify the role played by concentrated sulphuric acid
S + 2H 2 SO 4 $ 3SO 2 + 2H 2 O
(a) Non-volatile acid (b) Oxidising agent
(c) Dehydrating agent (d) None of these above

(xii) In which of the following compounds —OH is the functional group ?

(a) Butanol (b) Butanone
(c) Butanoic acid (d) Butanal

(xiii) Ammonium hydroxide is a weak alkali which dissociates partially to furnish ............... OH- ions precipitate
............... metal hydroxides.
(a) Insufficient, Soluble (b) Insufficient, Insoluble
(c) Sufficient, Insoluble (d) Sufficient, Soluble

(xiv) Liquid NH3 is employed in refrigerator because:

(a) it has high heat of evaporation. (b) it is stable hydride.
(c) it has a high dipole moment. (d) it is more basic.

(xv) A student named Riya is studying the electronic configuration of different elements. She comes across an
element X with an atomic number of 24. Based on the following options, help Riya determine the correct
electronic configuration of element X:
(a) 2, 8, 8, 6 (b) 2, 8, 8, 3
(c) 2, 8, 2, 8 (d) 2, 8, 7, 7


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ICSE 10th Chemistry Sample Paper 11 Page 3

QUESTION 2.
(i)

(a) Give the reaction which takes place between the reactants.
(b) What is the function of calcium oxide ?
(c) What is the function of inverted gas jar ?
(d) Can we use phosphorous pentaoxide to dry ammonia ? If not, why ?
(e) Which method for collection of gas is shown in the diagram ?
(ii) Match the options A to E with the statements (i) to (v):

A alkynes (i) No. of molecules in 22.4 dm3 of carbon dioxide at S.T.P

B alkane (ii) An element with electronic configuration 2,8,8,3

C iron (iii) C n H 2n + 2
D 6.023 # 1023 (iv) C n H 2n - 2

E metal (v) The metal that forms two types of ions

(iii) Complete the following by choosing the correct answers from the bracket:
(a) There are ______ (seventeen, eighteen) groups and ______ (six, seven) periods in the periodic
table.
(b) The ______ (higher/lower) the concentration of an ion in a solution, the greater is the probability
of being discharged at its appropriate electrode.
(c) Ammonia reacts with excess chlorine to form ______ (nitrogen/nitrogen tri-chloride/ammonium
chloride).
(d) The catalyst used for conversion of ethene to ethane is commonly ______ (nickel/iron/cobalt).
T
(e) Pb 3 O 4 + HCl (conc.) ______ + ______ + ______ _Cl2 /4H2 O/3PbCl2i .

(iv) Identify the following:

(a) Basicity of Sulphuric acid.
(b) Green coloured compound formed when SO 2 is passed through acidified Potassium dichromate.
(c) The elements present in the first period.
(d) A non-metal which has three electrons in the valence shell.
(e) The most electronegative element in the third period.
(v) Give the structural formula for the following :
(a) Methanoic acid
(b) Ethanal
(c) Ethyne
(d) Acetone
(e) 2-methyl propane.


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SECTION - B
(Attempt any four questions.)
QUESTION 3.

(i) Draw the structural formula for each of the following:

(a) Ethanoic acid
(b) But-2-yne

(ii) In this question you are required to supply the word for words that will make each sentence into correct
statement which is to be written down again completely.
(a) Copper sulphate crystals are dehydrated by sulphuric acid.
(b) Crystals of sulphur are obtained when a solution of sulphur in carbon disulphide is allowed to evaporate.

(iii) Study the extract of the Periodic Table given below and answer the questions that follow. Give the alphabet
corresponding to the element in question. DO NOT repeat an element.

(a) Which element forms electrovalent compound with G ?

(b) The ion of which element will migrate towards the cathode during electrolysis ?
(c) Which non-metallic element has the valency of 2 ?

(iv) During thunder storm, the rain water contains Nitric acid. The Nitric acid is formed as a result of three
chemical reactions. Describe (or write balanced chemical equations for) these three reactions.

QUESTION 4.

(i) (a) To protect iron from rusting it is coated with a thin layer of zinc. Name this process.
(b) Name a non-metal that has a metallic lustre and sublimes on heating.
(ii) In a chemistry experiment, a student named Arjun is analyzing a gaseous fluoride of phosphorus. He
measures 112 cc of the fluoride, which has a mass of 0.63 g. Using this information, help Arjun calculate the
relative molecular mass of the fluoride. If the molecule contains only one atom of phosphorus, assist Arjun
in determining the formula of the phosphorus fluoride. [F = 19; P = 31]

(iii) Identify the substances A, B, C, D and E in the following reactions. Also give a balanced equation for each
conversion.

(iv) What will you observe when:

(a) Hydrogen chloride gas is passed through Silver nitrate solution?
(b) Hydrogen chloride gas comes in contact with Ammonia solution?
(c) Hydrogen chloride gas is passed through Lead nitrate solution and the product thus formed is heated?


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ICSE 10th Chemistry Sample Paper 11 Page 5

QUESTION 5.
(i) Write a balanced equation for a reaction in which ammonia is oxidised by :
(a) a metal oxide;
(b) a gas which is not oxygen.
(ii) Define the term neutralisation.
(iii) Choose the answer from the list which fits the description.
(Calcium silicate, zone of heat absorption, coke, combustion zone, alumina)
(a) Name of the compound which is formed by the reaction between silica and calcium oxide.
(b) Name of the middle part zone of the blast furnace.
(c) A black powdery substance is used for the reduction of zinc oxide during its extraction process.
(iv) A student named Priya is conducting an experiment on the preparation of different organic compounds. She
is required to write balanced chemical equations for the following reactions. Help Priya by providing the
correct equations for each reaction:
(a) Preparation of ethene from bromoethane.
(b) Preparation of ethyne using calcium carbide.
(c) Preparation of methane from sodium acetate.

QUESTION 6.
(i) A student named Rohit is conducting an experiment with two flasks, each containing 2.0 g of gas at the
same temperature and pressure. One flask contains oxygen, and the other contains hydrogen. Help Rohit
answer the following questions:
(a) Which sample contains the greater number of molecules ?
(b) If the hydrogen sample contains N molecules, how many molecules are present in oxygen sample ?

(ii) (a) Give the name and formula of the acid salt which gives sodium ions and sulphate ions in solution.
(b) From the following list of substances, choose those which meet the description given below. Ammonium
chloride, ammonium nitrate, chlorine, dilute hydrochloric acid, iron, lead nitrate, manganese (IV) oxide,
silver nitrate, sodium nitrate sulphur. Two compounds whose aqueous solution gives white precipitate
with dilute hydrochloric acid.
(iii) Electrolysis is used in the purification of metals. Name :
(a) the anode
(b) the cathode
(c) the electrolyte, you would used to get pure copper from a piece of impure copper.

(iv) With reference to electroplating, answer the following :

(a) Why are articles electroplated ?
(b) During electroplating, explain why :
(1) a direct current is used.
(2) a small current should be used for a longer time.

QUESTION 7.
(i) State one important use of each :
(a) Ethanol
(b) Acetylene
(c) Chloroform

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(ii) Write balanced equations to satisfy each statement:

(a) Acid + Sulphide " Salt + Hydrogen sulphide
(b) Acid + Active metal " Salt + Hydrogen
(c) Acid + Base " Salt + Water

(iii) Consider the section of the periodic table given below :

Group numbers IA IIA IIIA IVA VA VIA VIIA 0

1 2 13 14 15 16 17 18
Li F O J Ne
A Mg E Si H K
B C F G L

Note : In this table B does not represent boron

C does not represent carbon
F does not represent fluorine
H does not represent hydrogen
K does not represent potassium
You must see the position of the element in the periodic table.
Some elements are given in their own symbol and position in the periodic table, while others are shown with
a letter. With reference to the table :
(a) Which is the most electronegative ?
(b) How many valence electrons are present in G?
(c) Write the formula of the compound between B and H.
(d) In the compound between F and J, what type of bond will be formed ?

QUESTION 8.

(i) Write a balanced chemical equation for each of the following :

(a) Reaction of sodium hydroxide solution with iron (III) chloride solution.
(b) Reaction of zinc with potassium hydroxide solution.

(ii) Nitrogen and water are both covalent compounds but nitrogen is a gas and water is a liquid at room
temperature. Explain.

(iii) A student named Anjali is studying the properties of concentrated sulfuric acid. She is asked to demonstrate
the following properties of concentrated sulfuric acid by providing one reaction for each property, along with
the balanced chemical equations:
(a) Concentrated sulfuric acid has a great affinity for water.
(b) Concentrated sulfuric acid is an oxidizing agent.
(c) Concentrated sulfuric acid is the least volatile acid.

(iv) Give reasons:

(a) Pure nitric acid gives a yellow brown colour when exposed to light.
(b) Colourless nitric oxide forms brown fumes in air.
(c) Aluminium is more active metal than iron, but suffers less corrosion.

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ICSE 10th Chemistry Sample Paper 12 Page 1

Sample Paper 12
ICSE Examination Class X 2024-25
Chemistry
Science Paper - 2
Time: 2 Hours Max. Marks: 80
General Instructions:
1. Answer to this Paper must be written on the paper provided separately.
2. You will not be allowed to write during first 15 minutes.
3. This time is to be spent in reading the question paper.
4. The time given at the head of this Paper is the time allowed for writing the answers.
5. Section A is compulsory. Attempt any four questions from Section B.

SECTION - A
(Attempt all questions from this Section.)

QUESTION 1.
Choose the correct answers to the questions from the given options.
(Do not copy the questions, write the correct answer only.)

(i) In a circuit below, the lamp lights up

What could X be ?
(a) A solution of alcohol and water (b) A solution of sodium chloride in water
(c) Sugar solution (d) Solid potassium chloride

(ii) Assertion: Dry HCl gas does not change the colour of the dry litmus paper.
Reason: It is because dry HCl does not contain the OH- ions.
(a) Assertion and Reason both are correct statements and reason is the correct explanation of the assertion.
(b) Assertion is true, but reason is false.
(c) Assertion and Reason both are correct statements, but reason is not the correct explanation of the
assertion.
(d) Assertion is false, but reason is true.

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Page 2 Sample Paper 12 NODIA

(iii) If an element has low ionisation potential, then it is likely to be a

(a) metal (b) metalloid
(c) non-metal (d) inert gas

(iv) The equation between an acid and a base is

XOH + HY " XY + H2O
In the given equation, which specie act as a cation?
(a) Y (b) OH
(c) H (d) X

(v) Assertion : Noble gases are placed in different group in periodic table.
Reason : Noble gases are inert in nature.
(a) Assertion and reason both are correct statements and reason is the correct explanation of the assertion.
(b) Assertion is true, but reason is false.
(c) Assertion and reason both are correct statements, but reason is not the correct explanation of the
assertion.
(d) Assertion is false, but reason is true

(vi) In the electrolysis of CuSO4 solution using platinum electrodes, gas produced at anode is :
(a) Sulphuric acid (b) Oxygen
(c) Sulphur dioxide (d) Copper ions

(vii) Identify the metallic oxide which is amphoteric in nature:

(a) Calcium oxide (b) Zinc oxide
(c) Barium oxide (d) Copper(II) oxide.

(viii) Arrange the following as per instruction given in the brackets :K, CI, Na, S, Si (increasing order of atomic
size)
(a) Na < S < Cl < K < Si (b) K < Na <Si < CI < S
(c) K < Na < Si < S < Cl (d) Si < S < Cl < Na

(ix) In a laboratory setting, a chemist is analyzing a sample of nitric acid and notices a yellow coloration in
the solution. The chemist recalls that this yellow color can indicate the presence of a specific dissolved
component. Identify the component responsible for the yellow color of nitric acid from the options below:
(a) NO2 (b) NH3
(c) O2 (d) NO3

(x) The element with lowest ionization energy among the following is:
(a) Rb (b) N
(c) K (d) Li

(xi) Molecular formula of chile salt petre.

(a) NaNO3 (b) Na2SO4
(c) CaCO3 (d) CH3NH2

(xii) Triple bond is present in

(a) Alkanes (b) Alkenes
(c) Alkyls (d) Alkynes

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ICSE 10th Chemistry Sample Paper 12 Page 3

(xiii) If the empirical mass of the formula PQ2 is 10 and the relative molecular mass is 30, then the molecular
formula will be
(a) PQ2 (b) P3Q2
(c) P6Q3 (d) P3Q6

(xiv) In a laboratory experiment, when ammonia gas is prepared by heating ammonium chloride (NH4Cl), the
solid ammonium chloride sublimates to produce ammonia gas. Identify the sublimable component in this
reaction from the options below:
(a) Sodium Chloride (NaCl) (b) Ammonia (NH4)
(c) Ammonium Chloride (NH4Cl) (d) Sodium Hydride (NaH)
(xv) Which of the following is most electronegative?
(a) Tin (b) Silicon
(c) Lead (d) Carbon

QUESTION 2.

(i) (a) Write the equation for the formation of ammonia by the action of water on magnesium nitride.
(b) How is ammonia collected ?
(c) How would you distinguish between Zn2+ and Pb2+ ions using ammonium hydroxide solution ?

(ii) Match the following Column A with Column B :

Column A Column B

1. Acid salt A. Ferrous ammonium

2. Double salt B. Contains only ions sulphate

3. Ammonium hydroxide solution C. Sodium hydrogen sulphate

4. Dilute hydrochloric acid D. Contains only molecules

5. Carbon tetrachloride E. Contains ions and molecules

(iii) Complete the following by choosing the correct answers from the bracket:
(a) Moving across a _____ of the periodic table the elements show increasing _____character. (group,
period, metallic, non-metallic).
(b) pH of acetic acid is greater than dilute sulphuric acid. So acetic acid contains ______concentration
of H+ ions. (greater, same, low).
(c) A thermite mixture contains iron (III) oxide and aluminium, in which______ (aluminium/iron (III)
oxide) is in a higher ratio in the mixture.
(d) Dilute sulphuric acid reacts with active metals to liberate _____ and form their sulphates.
(e) During the formation of hydrogen chloride, a hard mass which sticks to the glass vessel is _____
(sodium sulphate/sodium borate).

(iv) Identify the following:

(a) The element which has the highest ionisation potential.
(b) The family of elements to which chlorine belongs.
(c) An element having highest electron affinity.
(d) The element with least I.E. in the second period.
(e) Name the aqueous salt solution used for testing sulphate radical.

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(v)

(a) What is the reaction which is taking place ?

(b) Give the function of acidified copper sulphate solution.
(c) Give a reaction in which acetylene gas is prepared by synthesis reaction.
(d) Compare the reaction of acetylene with bromine water and liquid bromine.
(e) What happens when acetylene is heated in copper tube at 600cC ?

SECTION - B
(Attempt any four questions.)

QUESTION 3.

(i) (a) Why pure acetic acid is known as glacial acetic acid?
(b) What type of compound is formed by the reaction between acetic acid and an alcohol?

(ii) State one relevant reason for the following :

Hydrated copper sulphate crystals turn white on heating.

(iii) How do the following vary in period 3? (from left to right)

(a) Atomic size
(b) Metallic character
(c) Non-metallic character

(iv) Define basicity of an acid. Give the basicity of :

(a) nitric acid
(b) acetic acid
(c) phosphoric acid.

QUESTION 4.

(i) (a) Name an oxide which forms salts when it reacts both with acids and alkalies.
(b) Calcium, Copper, Lead, Aluminium, Zinc, Chromium, Magnesium, Iron. Choose the major metals that
make the following alloys :
(1) Stainless steel
(2) Brass.

(ii) A compound made-up of two elements X and Y has an empirical formula X2 Y . If the atomic weight of X
is 10 and that of Y is 5 and the compound has a vapour density 25, find its molecular formula.
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ICSE 10th Chemistry Sample Paper 12 Page 5

(iii) Give balanced chemical equations for each of the following :

(a) Lab preparation of ammonia using an ammonium salt.
(b) Reaction of ammonia with excess chlorine.
(c) Reaction of ammonia with sulphuric acid.

(iv) The following questions are pertaining to the laboratory preparation of hydrogen chloride gas.
(a) Write the equation for its preparation mentioning the conditions required.
(b) Name the drying agent used and justify your choice.
(c) State a safety precaution you would take during the preparation of hydrochloric acid.

QUESTION 5.

(i) Why ammonium hydroxide is used in qualitative analysis ? Give two equations to justify your answer.

(ii) In a laboratory experiment, a chemist named Manoj tests three solutions, P, Q, and R, which yield pH
values of 3.5, 5.2, and 12.2, respectively. Based on the pH values, identify which solution corresponds to
(a) a weak acid and
(b) which one corresponds to a strong alkali?

(iii) Choose the substances given in the box below to answer the following questions.

Acid salts Neutralisation reaction Calcium oxide

Decomposition reaction Basic salts Aluminium oxide
(a) Name the metal oxide which can react with an acid as well as base.
(b) Which reaction involves the formation of salts?
(c) Which type of salts is NaHSO3?

(iv) Write balanced equation for the preparation of the following :

(a) Ethane from sodium propionate.
(b) Ethene from ethanol.
(c) Ethyne from calcium carbide.

QUESTION 6.

(i) What is the number of moles in

(a) 22.4 litres of Ammonia gas at S.T.P.?
(b) 44.8 litres of Carbon dioxide at S.T.P.?

(ii) (a) Name a substance which changes the blue colour of copper sulphate crystals to white.
(b) Anhydrous hydrogen chloride is not an acid but its aqueous solution is a strong acid. Explain.

(iii) An aqueous solution of nickel (II) sulphate was electrolysed using nickel electrodes. Observe the diagram
and answer the questions that follow :

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(a) What do you observe at the cathode and anode respectively ?

(b) Name the cation that remains as a spectator ion in the solution.
(c) Which reaction is happened at the anode ?

(iv) (a) Conducting nature of ionic compounds is due to ______.

(b) NaCl is a poor conductor of electricity in the ______.
(c) A solution of ______ cannot be kept in zinc vessel.

QUESTION 7.

(i) Give IUPAC names of the following:

(a) CH 3 - CH / CH 2
(b) CH 3 - CH 2 - CHO
(c)

(ii) Give the equations for the following conversions A to E .

(iii) How will you prepare the following from nitric acid ?
(a) Sodium nitrate
(b) Copper nitrate
(c) Lead nitrate
(d) Magnesium nitrate

QUESTION 8.

(i) What would you observe in the following case ?

Ammonium hydroxide is first added in a small quantity and then in excess to a solution of copper sulphate.

(ii) An element X is a metal with valency 3. Element Y is a non-metal with valency 3

(a) Write equations to show how X and Y form ions.
(b) If Y is a diatomic gas, write the equation for the direct combination of X and Y to form a compound.

(iii) Three test tubes contain calcium nitrate solution, zinc nitrate solution and lead nitrate solution respectively.
Each solution is divided into two portions (a) and (b). Describe the effect of:
(a) Adding sodium hydroxide to each portion in turn till it is in excess.
(b) Adding ammonium hydroxide to each portion in turn till it is in excess.

(iv) Explain the following.

(a) Direct absorption of HCl gas in water is not preferred.
(b) All glass apparatus is used in the laboratory preparation of HNO3.
(c) NaCl has a high melting point.

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ICSE 10th Chemistry Sample Paper 13 Page 1

Sample Paper 13
ICSE Class X 2024-25
Chemistry
Science Paper - 2
Time: 2 Hours Max. Marks: 80
General Instructions:
1. Answer to this Paper must be written on the paper provided separately.
2. You will not be allowed to write during first 15 minutes.
3. This time is to be spent in reading the question paper.
4. The time given at the head of this Paper is the time allowed for writing the answers.
5. Section A is compulsory. Attempt any four questions from Section B.

SECTION - A
(Attempt all questions from this Section.)

QUESTION 1.
Choose the correct answers to the questions from the given options.
(Do not copy the questions, write the correct answer only.)

(i) A compound which liberates reddish brown gas around the anode during electrolysis in its molten state is :
(a) Sodium chloride (b) Copper (II) oxide
(c) Copper (II) sulphate (d) Lead (II) bromide

(ii) Assertion (A): Formic acid is an organic weak acid.

Reason (R): Organic acids only partially dissociate in water, unlike strong mineral acids.
(a) Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion
(A).
(b) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion
(A).
(c) Assertion (A) is true, but Reason (R) is false.
(d) Assertion (A) is false, but Reason (R) is true.

(iii) An element A belonging in Period 3 and Group II will have

(a) 3 shells and 3 valence electrons (b) 2 shells and 3 valence electrons
(c) 3 shells and 2 valence electrons (d) 2 shells and 2 valence electrons

(iv) Which one of the following will not produce an acid when made to react with water ?
(a) Nitrogen dioxide (b) Carbon dioxide
(c) Carbon monoxide (d) Sulphur trioxide

(v) Boiling point and melting point of halogens ______ (increase/ decrease) with increase in atomic number.
(a) increases (b) remains same
(c) non-uniformly varies (d) decreases
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(vi) It is recommended that ammonia bottles should be opened after cooling in ice for sometime. This is because
(a) it has high vapour pressure (b) it brings tears
(c) it is explosive liquid (d) none of these

(vii) Assertion (A): Calcium hydroxide completely dissociates into ions when dissolved in water.
Reason (R): The presence of hydroxide ions in the solution gives it antimicrobial properties.
(a) Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion
(A).
(b) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion
(A).
(c) Assertion (A) is true, but Reason (R) is false.
(d) Assertion (A) is false, but Reason (R) is true.

(viii) Which of the following statements is not a correct statement about the trends when going from left to right
across the Periodic Table?
(a) The elements become less metallic in nature. (b) The atoms lose their electrons more easily.
(c) The number of valency electrons increases. (d) The oxides become more acidic.

(ix) HNO3 in pure state is colourless but it is often of yellow colour. It is due of
(a) unstable structure of HNO3 which immediately changes to NO2 .
(b) conversion of HNO3 into NO+2 .
(c) interaction of atmospheric gases with HNO3 .
(d) photochemical decomposition in presence of sunlight.

(x) The most metallic element in its respective group is placed :

(a) At the top
(b) In the middle
(c) At the bottom
(d) Sometimes in the middle and sometimes at the top

(xi) Dilute sulphuric acid will produce a white precipitate when added to a solution of :
(a) copper nitrate (b) zinc nitrate
(c) lead nitrate (d) sodium nitrate

(xii) The IUPAC name for iso-butyl group is

(a) 2-methylethyl (b) 1, 1-dimethylethyl
(c) 1-methylpropyl (d) 2-methylpropyl

(xiii) Zinc hydroxide forms gelatinous .......... ppts.

(a) red soluble (b) yellow insoluble
(c) white soluble (d) white insoluble

(xiv) Which of the following-statements is incorrect about ammonia?

(a) It can be dried by P2O5, H2SO4 and CaCl2.
(b) It gives black precipitate with calomel.
(c) It is oxidised by oxygen at 700°C in the presence of platinum.
(d) It gives white fumes with HCl.

(xv) A chemistry student is analyzing the trend of ionization potential across a period in the periodic table. The
student needs to understand how atomic structure affects this property.
Ionization potential increases over a period from left to right because:

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ICSE 10th Chemistry Sample Paper 13 Page 3

(a) Atomic radius increases and nuclear charge increases.

(b) Atomic radius decreases and nuclear charge increases.
(c) Atomic radius increases and nuclear charge decreases.
(d) Atomic radius and nuclear charge decrease.]

QUESTION 2.

(i) (a) Name one element, in following case, to which the following description would apply:
The burning metal which combines directly with Nitrogen.
(b) Name the gas that you can obtain in the laboratory from each of the following and write the equation
for the reaction taking place in each case:
(1) Ammonium nitrite
(2) Ammonium chloride
(c) What CFC’s commonly called as ?

(ii) Match the column I with column II:

Column-I Column-II
(i) Ferric chloride (a) Precipitation
(ii) Sodium chloride (b) Simple displacement
(iii) Magnesium sulphate (c) Metal oxide and dilute acid
(iv) Lead chloride (d) Synthesis
(v) Copper sulphate (e) Neutralisation

(iii) Complete the following by choosing the correct answers from the bracket:
(a) The properties of element which reoccur after a regular interval are called ______ (periodic/column)
properties.
(b) Non-metals have ______ (high/low) electron affinity.
(c) When ammonium chloride is heated, it undergoes ______(thermal decomposition/thermal
dissociation).
(d) The product formed when ethene gas reacts with water in the presence of sulphuric acid is_____
(ethanol/ethanal/ethanoic acid)
(e) NaCl + H 2 SO 4 (conc.) $ ______ ( NaHSO 4, Na.H2 ) + ______ ( HCl, SO 4 Cl ).

(iv) Identify the following:

(a) A black coloured substance formed when Sugar is dehydrated.
(b) The amount of energy released when an atom in the gaseous state accepts an electron to form an anion.
(c) The energy released when an electron is added to a neutral gaseous isolated atom to form a negatively
charged ion.
(d) The tendency of an atom to attract electrons towards itself when combined in a covalent compound.
(e) An alkaline earth metal present in group 2 and period 3.

(v) A. (a) State the structural formula of ethane.

(b) What type of reaction has taken place between ethane and chlorine ?
(c) What type of reaction between ethene and chlorine ?
(d) What feature of the ethene structure makes such a reaction possible ?
(e) Name the product of the reaction between ethene and chlorine.
B. Write the equation of the complete combustion of ethane.
C. Burning acetylene (ethyne) in oxygen produces a very hot flame. What is this hot flame used for ?

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SECTION - B
(Attempt any four questions.)

QUESTION 3.

(i) Methane is the first member of alkane, when it is treated with excess of chlorine in the presence of diffused
sunlight forms carbon tetrachloride. Draw the appropriate structural formula of carbon tetrachloride and
state the type of bond present in it.

(ii) Why SO3 is not directly dissolved in water to form sulphuric acid ?

(iii) Elements X, Y and Z have atomic number 6, 9 and 12 respectively. Which one ?
(a) Forms an anion.
(b) Forms a cation.
(c) Has four electrons in its valence shell.

(iv) Nitric acid cannot be concentrated beyond 68% by the distillation of a dilute solution of HNO3. Explain
why ?

QUESTION 4.

(i) (a) Name the compound added to pure alumina to lower the fusion temperature during the electrolytic
reduction of alumina.
(b) Write the equation for the reaction that occurs at the cathode during the extraction of aluminium by
electrolysis.

(ii) Determine the empirical formula of a compound containing 47.9% potassium, 5.5% beryllium and 46.6%
fluorine by mass.
(Atomic weight of Be = 9; F = 19; K = 39)
Work to one decimal place.

(iii) (a)
(1) Which feature of the Ammonia molecules leads to the formation of Ammonium ion when Ammonia
dissolves in Water ?
(2) Name the other ion formed when Ammonia dissolves in Water.
(3) Give one test that can be used to detect the presence of the ion produced in (a) (2).
(b) Write the equations for the following reactions which result in the formation of Ammonia:
(1) A mixture of Ammonium chloride and Slaked lime is heated.
(2) Aluminium nitride and Water.

(iv) Explain the following :

(a) Dry hydrogen chloride gas does not affect a dry strip of blue litmus paper but it turns red in the
presence of a drop of water.
(b) Hydrogen chloride gas is not collected over water.

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QUESTION 5.

(i) State two relevant observations, for each of the following:

(a) Ammonium hydroxide solution is added to copper (II) nitrate solution in small quantities and then in
excess.
(b) Ammonium hydroxide solution is added to zinc nitrate solution in minimum quantities and then in
excess.

(ii) State your observation when :

Barium chloride solution is mixed with Sodium Sulphate Solution.

(iii) Choose the substances given in the box below to answer the following questions.

Acid salts Neutralisation reaction Calcium oxide

Decomposition reaction Basic salts Aluminium oxide
(a) Name the metal oxide which can react with an acid as well as base.
(b) Which reaction involves the formation of salts?
(c) Which type of salts is NaHSO3?

(iv) What is the general formula of a saturated hydrocarbon ?

(a) Give an example of such a hydrocarbon along with its structural formula.
(b) A white solid on treating with water liberates acetylene gas. Name the solid.
(c) Write an equation for the preparation of ethylene gas from ethyl alcohol.

QUESTION 6.

(i) What is the number of molecules in

(a) 10 grams of Calcium carbonate?
(b) 3.6 grams of Water?

(ii) (a) Name a substance which changes the blue colour of copper sulphate crystals to white.
(b) Anhydrous hydrogen chloride is not an acid but its aqueous solution is a strong acid. Explain.

(iii) A student is conducting the electrolysis of copper (II) chloride solution using a platinum cathode and a
carbon anode. The student needs to observe and explain what happens at both the anode and cathode,
along with providing the ionic equations for the reactions occurring at each electrode. Describe what you
would see at anode and cathode during electrolysis of copper (II) chloride, using platinum cathode and
carbon anode. Write ionic equations for the reactions at anode and cathode.

(iv) Give reasons for the following :

(a) Aluminium is extracted from its oxide by electrolytic reduction and not by conventional reducing
agents.
(b) The volume of hydrogen and oxygen formed at the cathode and anode are 2 : 1 by volume respectively.
(c) In the electrolysis of acidified water dilute sulphuric acid is preferred to dilute nitric acid for acidification.

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QUESTION 7.

(i) Draw the relevant structural formula of :

(a) acetylene
(b) 2-Butyne
(c) propylene

(ii) For each of the salts A , B , C and D suggest a suitable method of preparation which relates to its
description given below.
(a) ‘A’ is a sodium salt.
(b) ‘B ’ is an insoluble salt.
(c) ‘C ’ is a soluble salt of copper.
(Do not describe the procedure for the preparation. Refer only to the appropriate method.)

(iii) A student is studying the periodic table and analyzing the electronic configurations of three elements, X, Y,
and Z. The student is asked to determine the position of these elements in the periodic table based on their
electronic configurations as shown below :

X 2
Y 2, 6
Z 2, 8, 2
(a) Which element belongs to second period?
(b) Which element belongs to second group?
(c) Which element belongs to zero group ?

QUESTION 8.

(i) What are the colour of the precipitates when ammonium hydroxide is added to the following solutions?
(a) Iron(II) chloride
(b) Iron(III) chloride

(ii) By drawing an electron dot diagram, show the formation of ammonium Ion.
[Atomic No.: N = 7 and H = 1]

(iii) Describe experiments to prove that sulphuric acid contains (a) hydrogen (b) oxygen.

(iv) Explain the following.

(a) Direct absorption of HCl gas in water is not preferred.
(b) All glass apparatus is used in the laboratory preparation of HNO3.
(c) NaCl has a high melting point.

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ICSE 10th Chemistry Sample Paper 14 Page 1

Sample Paper 14
ICSE Class X 2024-25
Chemistry
Science Paper - 2
Time: 2 Hours Max. Marks: 80
General Instructions:
1. Answer to this Paper must be written on the paper provided separately.
2. You will not be allowed to write during first 15 minutes.
3. This time is to be spent in reading the question paper.
4. The time given at the head of this Paper is the time allowed for writing the answers.
5. Section A is compulsory. Attempt any four questions from Section B.

SECTION - A
(Attempt all questions from this Section.)

QUESTION 1.
Choose the correct answers to the questions from the given options.
(Do not copy the questions, write the correct answer only.)

(i) Identify the weak electrolyte from the following:

(a) Sodium chloride solution (b) Dilute hydrochloric acid
(c) Dilute sulphuric acid (d) Aqueous acetic acid.

(ii) The gas liberated when sodium sulphites reacts with dilute sulphuric acid:
(a) Carbon dioxide (b) Hydrogen
(c) Sulphur dioxide (d) Hydrogen sulphide

(iii) On moving from left to right across a period of the periodic table, the electron affinity of the elements in
groups 1 to 7 :
(a) Goes up and then down (b) Decreases and then increases
(c) Decreases (d) Increases

(iv) Which gas is evolved when HNO 3 react with sodium bicarbonate?
(a) CO 2 (b) SO 2
(c) H 2 (d) H 2 S

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(v) If an electron .......... energy it jumps to lower energy level from high energy level.
(a) Lose (b) Gain
(c) Equal (d) Not of the above

(vi) The gas law which relates the volume of a gas to the number of molecules of the gas is :
(a) Avogadro’s Law (b) Gay Lussac’s Law
(c) Boyle’s Law (d) Charle’s Law

(vii) Sodium hydroxide turns phenolphthalein solution.

(a) Orange (b) Yellow
(c) Colourless (d) Pink

(viii) Assertion (A) : Sodium hydroxide turns phenolphthalein solution pink.

Reason (R) : In an alkaline solution, phenolphthalein produces a pink hue as an indication of the reaction’s
endpoint when it interacts with the base’s hydroxide ions.
(a) Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion
(A).
(b) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion
(A).
(c) Assertion (A) is true, but Reason (R) is false.
(d) Assertion (A) is false, but Reason (R) is true.

(ix) The non-metallic character of the elements down the group

(a) Remains the same (b) Increases
(c) Decreases (d) Depends on the period

(x) Diammonium hydrogen phosphate, (NH4)2 HPO4, is a widely used fertilizer. Which of the following substance
could be added to this compound to produce a mixture that provides the three principle elements needed
for plant growth?
(a) Magnesium nitrate (b) Ammonium sulphate
(c) Ammonium phosphate (d) Potassium chloride

(xi) The amount of energy released when one or more electron is added to the neutral atom.
(a) Ionisation energy (b) Electron affinity
(c) Electro-negativity (d) Atomicity

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(xii) When dilute sulphuric acid reacts with iron sulphide, the gas evolved is
(a) Hydrogen sulphide (b) Sulphur dioxide
(c) Sulphur trioxide (d) Vapour of sulphuric acid

(xiii) Which of the following hydroxide is soluble in excess of NaOH?

(a) Cr(OH)3 (b) Zn(OH)2
(c) Ca(OH)2 (d) Fe(OH)3

(xiv) Ammonium nitrate is used ______.

(a) in lining vessels 0(b) as a smelling salt
(c) in textile industry (d) in preparing explosives

(xv) Assertion (A): The element with the electronic configuration 2, 8, 18, 3 belongs to the 13th group of the
Modern Periodic Table.
Reason (R): Elements in the 13th group of the Modern Periodic Table have three electrons in their outermost
shell.
(a) Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion
(A).
(b) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion
(A).
(c) Assertion (A) is true, but Reason (R) is false.
(d) Assertion (A) is false, but Reason (R) is true.

QUESTION 2.

(i) Write equation for the following :

(a) Burning of ammonia in oxygen.
(b) How soluble is ammonia in water ?
(c) Give two evidences to show that the solution of ammonia in water contains hydroxide ions.
(d) Name a simple method that you would employ to prepare ammonium salts in your laboratory.

(ii) Match the column I with column II :

Column-I Column-II
(i) Sulphur dioxide (a) Sulphuric acid
(ii) Oil of vitriol (b) Burning sulphur smell
(iii) Oleum (c) Rotten egg smell
(iv) Sulphur trioxide (d) Pyrosulphuric acid
(v) Hydrogen sulphide (e) Anhydride of sulphuric acid.

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(iii) Complete the following by choosing the correct answers from the bracket:
(a) Metals have low ______ (ionization energy/kinetic energy) and non-metals have high ______
(electron affinity/electron Probability).
(b) Metals are good ______ (oxidizing agents/reducing agents) because they are electron ______
(acceptors/donors).
(c) Ammonium chloride is a soluble salt prepared by ______ (precipitation/neutralisation).
(d) Ethanoic acid reacts with ethanol in presence of concentrated H2SO4, so as to form a compound and
water. The chemical reaction which takes place is called ______.(dehydration/hydrogenation/
esterification).
(e) The major cause of periodicity is the recurrence of similar ______ (electronic configuration/electric
configuration).

(iv) Identify the following:

(a) Gas obtained by dehydration of Ethanol.
(b) A dilute mineral acid which forms a white precipitate when treated with barium chloride solution.
(c) The noble gas with duplet arrangement of electrons.
(d) The non-metallic element present in third period other than sulphur and oxygen.
(e) The gas evolved on reaction of aluminium with boiling concentrated caustic alkali solution.

(v) (a) Give balanced equations for the laboratory preparations of the following organic compounds:
(1) A saturated hydrocarbon from iodomethane.
(2) An unsaturated hydrocarbon from an alcohol.
(3) An unsaturated hydrocarbon from calcium carbide.
(b) Give the structural formulae for the following:
(1) An isomer of n-butane.
(2) 2-propanol.

SECTION - B
(Attempt any four questions.)

QUESTION 3.

(i) (a) Draw the structural formulae of the two isomers of Butane. Give the correct IUPAC name of each
isomer.
(b) State one use of acetylene.

(ii) Write the equation for the following reactions:

(a) Dilute Sulphuric acid and Barium chloride
(b) Dilute Sulphuric acid and Sodium sulphide

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ICSE 10th Chemistry Sample Paper 14 Page 5

(iii) Two columns A and B are given.

Column A Column B
1. Sodium chloride Covalent bond
2. Ammonium ion Ionic bond
3. Carbon tetrachloride. Covalent and Coordinate bond
Answer as follows :
(a) Correct item from B matching sodium chloride.
(b) Correct item from B matching ammonium ion.
(c) Correct item from B matching carbon tetrachloride.

(iv) A student is using an apparatus in the laboratory to prepare nitric acid and is asked to identify the
substances involved, as well as to understand the reactions that occur during and after the preparation. The
following questions relate to this setup:

(a) Name A (a liquid), B (a solid) and C (a liquid). (Do not give the formulae)
(b) Write an equation to show how nitric acid undergoes decomposition.
(c) Write the equation for the reaction in which copper is oxidized by concentrated nitric acid.

QUESTION 4.

(i) (a) Name the solution used to react with Bauxite as a first step in obtaining pure aluminium oxide, in the
Baeyer’s process.
(b) Write the equation for the reaction where the aluminum oxide for the electrolytic extraction of aluminum
is obtained by heating aluminum hydroxide.

(ii) Find the empirical formula and the molecular formula of an organic compound from the data given below :
C = 75.92%, H = 6.32% and N = 17.76%
The vapour density of the compound is 39.5.
[C = 12, H = 1, N = 14]

(iii) Give reasons for the following :

(a) Though ammonium nitrite readily gives nitrogen on heating, a mixture of ammonium chloride and
sodium nitrite in water is heated to prepare nitrogen in laboratory.
(b) Ammonia cannot be collected over water.

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(iv) The following questions are related to the laboratory preparation of hydrochloride acid.
(a) Name the reactants used.
(b) Give suitable reason for choosing these reactants.
(c) Write balanced chemical equation for the reaction taking place below 200°C.

QUESTION 5.

(i) A student is conducting a set of experiments in the laboratory to observe the behavior of ammonia under
different conditions. Based on the experimental setup, the student is required to make observations for the
following cases:
(a) When ammonia gas is burnt in an atmosphere of oxygen in the absence of a catalyst, what observation
is made?
(b) What happens when a glass rod dipped in ammonium hydroxide is brought near the mouth of a
concentrated hydrochloric acid bottle?

(ii) Find the odd one out and explain your choice (note: valency is not a criterion)
(a) Al(OH)3, Pb(OH)2, Mg(OH)2, Zn(OH)2
(b) Formic acid, Nitric acid, Acetic acid, Propanoic acid.

(iii) X[2, 6] and Y[2, 8, 8, 1] are two elements.

Using this information complete the following.
(a) ______ is the metallic element.
(b) ______ is a reducing agent.

(c) When element X is strongly heated in element Y then compound ______ is formed.

(iv) Give the structural formula of the following:

(a) ethanol.
(b) 1-propanal.
(c) ethanoic acid.
(d) 1, 2, dichloroethane.

QUESTION 6.

(i) What is the mass in grams of

(a) 0.5 mole of Nitric acid?
(b) 3 moles of Sodium hydroxide?

(ii) (a) Two solutions X and Y have pH values of 3 and 9 respectively. Which one of these two will give a pink
colour with phenolphthalein indicator ?
(b) The pH value of pure water is 7. Compare the pH values of sulphur dioxide solution and ammonia
solution with that of pure water.

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ICSE 10th Chemistry Sample Paper 14 Page 7

(iii) (a) Write two applications of electrolysis in which the anode diminishes in mass.
(b) If the compound formed between X [a metal with a valency of 2] and Y [a non-metal with a valency
of 3] is melted and an electric current is passed through the molten compound, the element X will be
obtained at the ______and Y at the ______ of the electrolyte cell. [Provide the missing
words]
(c) What kind of particles will be found in a liquid compound which is non-electrolyte ?

(iv) Give reasons for the following :

(a) Electrolysis of molten lead bromide is considered a reaction in which oxidation and reduction i.e., a
redox reaction occurs.
(b) The blue colour of aqueous copper sulphate fades when it is electrolysed using platinum electrodes.
(c) Lead bromide undergoes electrolytic dissociation in the molten state but is a non-electrolyte in the solid
state.

QUESTION 7.

(i) Draw the relevant structural formula of :

(a) ethane, (b) marsh gas, (c) ethene

(ii) Answer the following questions relating to salts and their preparation:
(a) What is a salt?
(b) What kind of salt is prepared by precipitation?
(c) Name a salt prepared by direct combination. Write the equation for the reaction that takes place while
preparing the salt you have named.

(iii) A student is studying the periodic table and analyzing the properties of elements in one short period. The
student is asked to answer the following questions based on the arrangement of elements in this period:
The elements of one short period of the table are given below in order from left to right :
Li Be B C O F Ne
(a) To which period do these elements belong?
(b) One element of this period is missing. Which is the missing element and where should it be placed ?
(c) Which one of the elements in this period shows the property of catenation ?
(d) Place the three elements Fluorine, Beryllium and Nitrogen in the order of increasing electro-negativity.

QUESTION 8.

(i) Give a chemical test to distinguish between the following pair of compounds : Calcium nitrate solution and
zinc nitrate solution.

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(ii) How many covalent bonds are present in

(a) ammonia molecule and
(b) Methane molecule ?

(iii) A, B, C and D summarize the properties of Sulphuric acid depending on whether it is dilute or concentrated.
Choose the property (A, B, C or D) depending on which is relevant to each of the preparations (a) to (c).
(A) Dilute acid (typical acid property)
(B) Non-volatile acid
(C) Oxidizing agent
(D) Dehydrating agent.
(a) Preparation of Hydrogen chloride
(b) Preparation of Ethane from Ethanol
(c) Preparation of Copper sulphate from Copper oxide.

(iv) Choose the substance given in A, B, C with its properties given in 1 to 3.

A. Sulphur B. Hydrogen sulphite C. Graphite
(1) A non-metal which is a good conductor of electricity.
(2) A non-metal which reacts with concentrated nitric acid to form its own and as one of the product.
(3) Mono basic acid having molecular mass of 36.5 u.

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ICSE 10th Chemistry Sample Paper 15 Page 1

Sample Paper 15
ICSE Class X 2024-25
Chemistry
Science Paper - 2
Time: 2 Hours Max. Marks: 80
General Instructions:
1. Answer to this Paper must be written on the paper provided separately.
2. You will not be allowed to write during first 15 minutes.
3. This time is to be spent in reading the question paper.
4. The time given at the head of this Paper is the time allowed for writing the answers.
5. Section A is compulsory. Attempt any four questions from Section B.

SECTION - A
(Attempt all questions from this Section.)

QUESTION 1.
Choose the correct answers to the questions from the given options.
(Do not copy the questions, write the correct answer only.)

(i) The particles present in strong electrolytes are:

(a) only molecules (b) mainly ions
(c) ions and molecules (d) only atoms.

(ii) When dilute sulphuric acid reacts with iron sulphide, the gas evolved is .......... .
(a) hydrogen sulphide (b) sulphur dioxide
(c) sulphur trioxide (d) vapour of sulphuric acid

(iii) With reference to the variation of properties in the periodic table, which of the following is generally true ?
(a) Atomic size increases from left to right across a period.
(b) Ionisation potential increases from left to right across a period.
(c) Electron affinity increases going down a group.
(d) Electro-negativity increases going down a group.

(iv) The product of [H+] (aq.) and [OH-] (aq.) is called the .......... .
(a) Covalent compound (b) Molecular compound
(c) The Ionic product (d) Metallic compound

(v) Which of the following is a covalent chloride

(a) Phosphorus Chloride (b) Potassium Chloride
(c) Magnesium Chloride (d) Sodium Chloride

(vi) Assertion (A): The atomic mass of an element expressed in grams is called gram atomic mass.
Reason (R): Gram atomic mass is the atomic mass of an element in atomic mass units (amu) expressed in
grams and is numerically equal to the atomic mass.

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(a) Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion
(A).
(b) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion
(A).
(c) Assertion (A) is true, but Reason (R) is false.
(d) Assertion (A) is false, but Reason (R) is true.

(vii) Hydrated copper sulphate on heating changes to :

(a) Blue and crystalline (b) White and amorphous.
(c) Blue and amorphous (d) White and crystalline

(viii) Rajesh, a chemistry student, is analyzing three elements labeled A, B, and C based on their mass numbers
and number of neutrons.

Elements A B C
Mass numbers 23 20 35
Number of neutrons 12 0 18
To which groups do A, B and C belong?
(a) A belongs to IA group, B belongs to VIIA group, C belongs to zero group
(b) A belongs to VIIA group/ B belongs to IA group, C belongs to zero group
(c) A belongs to VIIA group/ B belongs to zero group/ C belongs to VIIA group
(d) A belongs to IA group, B belongs to zero group, C belongs to VIIA group

(ix) On photochemical decomposition of HNO3, the products formed are

(a) NO2 and O2 (b) NO and O
(c) N2O4 and NO2 (d) N2O5 and NO2

(x) Elements in a group, all have the same number of ...............

(a) electron shells (b) outermost valence electrons
(c) atomic number (d) none of the above

(xi) A fertilizer containing ammonium sulphate and calcium carbonate is sometimes used by agricultural farmers.
Why is the fertilizer useful?
(a) It provides nitrogen required for plant growth while reducing the acidity of the soil.
(b) It provides all the essential nutrients required for plant growth
(c) It provides both nitrogen and carbon dioxide required for plant growth
(d) It helps to reduce excess acidity of the soil.

(xii) Aliphatic carboxylic acids are known as ..........acids.

(a) fatty (b) aromatic
(c) aliphatic (d) carboxylic

(xiii) The salt which gives a dirty green precipitate with sodium hydroxide solution is
(a) iron (III) sulphate (b) iron (II) chloride
(c) iron (II) sulphate (d) iron (III) chloride

(xiv) .......... was the first organic compound to be synthesised in laboratory.

(a) Ammonia [NH3] (b) Urea (NH2CONH2)
(c) Methane (CH4) (d) Acetic Acid (CH3COOH)
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ICSE 10th Chemistry Sample Paper 15 Page 3

(xv) Assertion (A): Caesium is liquid at room temperature.

Reason (R): Caesium has a low melting point of about 28.5°C, which allows it to remain in a liquid state at
or slightly above room temperature.
(a) Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion (A).
(b) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion
(A).
(c) Assertion (A) is true, but Reason (R) is false.
(d) Assertion (A) is false, but Reason (R) is true.

QUESTION 2.

(i) Name :
(a) An acidic gas which reacts with a basic gas liberating neutral gas.
(b) A metallic chloride soluble in ammonium hydroxide.
(c) The gas obtained when ammonia burns in an atmosphere of oxygen without any catalyst.
(d) A nitride of a divalent metal which reacts with warm water liberating ammonia.
(e) An amphoteric oxide reduced by the basic gas.

(ii) Match the following column A with column B.

Column-I Column-II

(i) Sulphur dioxide (a) Sulphuric acid

(ii) Oil of vitriol (b) Burning sulphur smell
(iii) Oleum (c) Rotten egg smell
(iv) Sulphur trioxide (d) Pyrosulphuric acid
(v) Hydrogen sulphide (e) Anhydride of sulphuric acid.

(iii) Complete the following by choosing the correct answers from the bracket:
(a) If an element has a low ionisation energy then it is likely to be _____ (metallic/non-metallic).
(b) Electrovalent compounds have _____ (high/low) boiling point.
(c) Steel is converted to stainless steel by adding _____ and _____ . (Chromium nickel)
(d) Conversion of ethanol to ethane by the action of concentrated sulphuric acid is an example of_______.
(dehydration/dehydrogenation/ dehydrohalogenation)
(e) Hydrogen chloride gas on heating above 500°C gives hydrogen and chlorine. The reaction is an example
of_______ (thermal decomposition, thermal dissociation).

(iv) Identify the following:

(a) Process of formation of ions from the molecules.
(b) A thin film of a non-reactive metal over a superior metal.
(c) The electrode connected to the negative terminal of battery.
(d) Two compounds of Lead which combine with conc. HCl to liberate Chlorine.
(e) A polar covalent compound which on dissolving in water produces ions.

(v) What will you observe when

(a) Ethene is passed through Bromine solution in Carbon tetrachloride?
(b) Ethyne is passed through Fehling’s solution?
(c) Ethyne is passed through Tollens’ reagent?
(d) Sodium is dropped in Methanol?
(e) Ethene is passed through alkaline Potassium permanganate solution?

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SECTION - B
(Attempt any four questions.)

QUESTION 3.

(i) Distinguish between the saturated hydrocarbon ethane and the unsaturated hydrocarbon ethene by drawing
their structural formulae.

(ii) Identify the gas evolved and give the chemical test in each of the following cases :
(a) Dilute hydrochloric acid reacts with sodium sulphite.
(b) Dilute hydrochloric acid reacts with iron (II) sulphide.

(iii) Arrange the elements of group VII A according to the given conditions.
(a) Increasing atomic size
(b) Increasing non-metallic character
(c) Increasing ionisation potential

(iv) (a) The pH value of pure water is 7. Compare the pH values of sulphur dioxide solution and ammonia
solution with that of pure water.
(b) Name:
(1) Two bases which are not alkalies.
(2) A normal salt and acid salt of same acid.
(3) A salt insoluble in cold water but soluble in hot water.

QUESTION 4.

(i) For each of the substance listed below, describe the role played in the extraction of aluminum.
(a) Cryolite
(b) Sodium hydroxide

(ii) Oxygen oxidises ethyne to carbon dioxide and water as shown by the equation:
2C2H2 + 5O2 $ 4CO2 + 2H2O
What volume of ethyne gas at S.T.P. is required to produce 8.4 dm3 of carbon dioxide at S.T.P.?
[H = 1, C = 12, O = 16]

(iii) (a) Which of the two gases, Ammonia and Hydrogen chloride, which is more dense? Name the method of
collection of this gas.
(b) Write a balanced equation for a reaction in which Ammonia is oxidized by:
(1) a metal oxide,
(2) a gas which is not Oxygen.

(iv) Suresh, a chemistry student, is conducting an experiment to observe the reactions of manganese (IV)
oxide, lead (IV) oxide, and red lead (Pb2O3) with concentrated hydrochloric acid. He needs to analyze the
properties of these metal oxides and the reactions involved.
Manganese (IV) oxide, lead (IV) oxide and red lead (Pb3O4) react with concentrated hydrochloric acid
liberating chlorine.
(a) What is the common property shown by these metals oxides ?
(b) Write the equation for the reaction of hydrochloric acid with Pb3O4.
(c) What kind of compound can be added to the bleaching powder to obtain chlorine?
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ICSE 10th Chemistry Sample Paper 15 Page 5

QUESTION 5.

(i) What is Nessler’s reagent ? What test does it give with ammonium salts ?

(ii) State what would you observe when :

(a) Washing soda crystals are exposed to the atmosphere.
(b) The salt ferric chloride is exposed to the atmosphere.

(iii) Identify the particles present in following solutions and name them
(a) Ferric sulphate solution
(b) Potassium hydroxide solution
(c) Sodium carbonate

(iv) State the molecular formula and structural formula of ethane, ethene and ethyne. (State the IUPAC name
of each).

QUESTION 6.

(i) Define empirical formula and molecular formula of a compound.

(ii) (a) State your observation for the following case :

Paper soaked in potassium permanganate solution is introduced into a gas jar of sulphur dioxide.
(b) Write the equation for the following reaction: Zinc oxide is treated with sodium hydroxide solution

(iii) Hemant, a chemistry student, is conducting an electrolysis experiment using acidulated water in Hofmann’s
voltameter. During the experiment, two gases are liberated at the electrodes. Suresh is required to answer
the following questions based on his observations.s.
(a) Name the gases evolved at each electrode.
(b) What is the material used for electrodes?
(c) What is the ratio of gases evolved by volume?

(iv) Define :
(a) Electroplating
(b) What are the objects of electroplating ?

QUESTION 7.

(i) State how the following conversions can be carried out.

(a) Ethyl chloride to Ethyl alcohol
(b) Ethyl chloride to Ethane
(c) Ethane to Ethyl alcohol

(ii) Name the following :

(a) A complex salt solution used for testing a basic gas lighter than air.
(b) A base which reacts with hydrochloric acid to give a salt which on hydrolysis gives a slightly acidic
solution.
(c) An ion which combines with a polar covalent molecule to form ammonium ion.]

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(iii) Give a balanced chemical equation for each of the following:

(a) Action of conc. Nitric acid on Sulphur.
(b) Catalytic oxidation of Ammonia.
(c) Laboratory preparation of Nitric acid.
(d) Reaction of Ammonia with Nitric acid.

QUESTION 8.

(i) State your observations when ammonium hydroxide solution is added drop by drop and then in excess to
each of the following solutions:
(a) Copper sulphate solution
(b) Zinc sulphate solution.

(ii) Name the rule on which the combination of atoms to form molecules is based. Give two limitations of this
rule.

(iii) Conc. sulphuric acid reacts in various ways

(a) as an acid, (b) as a dehydrating agent, (c) as a less volatile acid. Give an equation for each of the various
ways in which it reacts.

(iv) State one relevant observation for each of the following reactions.
(a) Ammonium hydroxide solution is first added in a small quantity and then in excess to a solution of
copper sulphate.
(b) Sodium acetate is added to sodium hydroxide.
(c) Ammonia gas is passed over heated copper oxide.

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ICSE 10th Chemistry Sample Paper 16 Page 1

Sample Paper 16
ICSE Examination Class X 2024-25
Chemistry
Science Paper - 2
Time: 2 Hours Max. Marks: 80
General Instructions:
1. Answer to this Paper must be written on the paper provided separately.
2. You will not be allowed to write during first 15 minutes.
3. This time is to be spent in reading the question paper.
4. The time given at the head of this Paper is the time allowed for writing the answers.
5. Section A is compulsory. Attempt any four questions from Section B.

SECTION - A
(Attempt all questions from this Section.)

QUESTION 1.
Choose the correct answers to the questions from the given options.
(Do not copy the questions, write the correct answer only.)

(i) The electrolyte used for electroplating an article with silver is:
(a) silver nitrate solution. (b) silver cyanide solution.
(c) sodium argentocyanide solution. (d) nickel sulphate solution.

(ii) An electrolyte which completely dissociates into ions is :

(a) Alcohol (b) Carbonic acid
(c) Sucrose (d) Sodium hydroxide

(iii) Assertion (A): Chlorine is the most electronegative element among magnesium, chlorine, aluminium, and
sulphur.
Reason (R): Electro-negativity increases from left to right across a period, and chlorine is located at the
extreme right of these elements.
(a) Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion
(A).
(b) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion
(A).
(c) Assertion (A) is true, but Reason (R) is false.
(d) Assertion (A) is false, but Reason (R) is true.

(iv) A reaction in which proton combines with hydroxyl ions to form water.
(a) Precipitation reaction (b) acidification reaction
(c) neutralisation reaction (d) amphoteric reaction

(v) The element having largest atomic size in periods.

(a) Inert Gases (b) Metals Halogen
(c) Alkaline Earth Metals (d) Alkali

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(vi) The empirical formula for butane is :

(a) CH2 (b) C2H4
(c) C4H8 (d) C2H

(vii) Assertion (A): Magnesium hydroxide (Mg(OH)2) is used as an antacid.

Reason (R): Magnesium hydroxide reacts with excess stomach acid to form water and neutral salts, relieving
indigestion or heartburn.
(a) Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct explanation of Assertion
(A).
(b) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion
(A).
(c) Assertion (A) is true, but Reason (R) is false.
(d) Assertion (A) is false, but Reason (R) is true.

(viii) Magnesium atom is smaller than sodium atom. Why ?

(a) Because the electron shells are pulled inward more strongly in Na atom than in Mg atom.
(b) Because the electron shells are pulled inward more strongly in Mg atom than in Na atom.
(c) Because the electrons in magnesium are contained in three shells.
(d) None of the above

(ix) Lightning bolts in the atmosphere causes the formation of

(a) NO (b) NH3
(c) NH4OH (d) NH2OH

(x) Identify the element belonging to third period and 17th group of the periodic table.
(a) Silicon (b) Bromine
(c) Sulphur (d) Chlorine

(xi) Rahul, a chemistry student, is conducting an experiment involving potassium iodide solution and nitric acid.
He observes that when a paper soaked in potassium iodide solution is exposed to nitric acid, the paper turns
brown. Rahul needs to determine the substance responsible for this color change.
Nitric acid turns a paper soaked in potassium iodide solution brown due to liberation of :
(a) Hydrogen iodide (b) Nitrogen dioxide
(c) Copper (d) Iodine

(xii) Vinegar is the commercial name of .......... .

(a) ethanoic acid (b) phenol
(c) benzene (d) benzoic acid

(xiii) Hydroxide of this metal is soluble in sodium hydroxide solution.

(a) Magnesium (b) Lead
(c) Silver (d) Copper

(xiv) Saturated solution of ammonia in water.

(a) Liquid ammonia (b) Liquor ammonia fortis
(c) Liquid quicklime (d) Nersler’s reagent

(xv) Modern periodic table was given by .......... .

(a) John Newlands (b) Antoine Lavoisier
(c) Mendeleev (d) Moseley

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QUESTION 2.

(i) (a) When ammonium hydroxide is added to solution B, a pale blue precipitate is formed. This pale blue
precipitate dissolves in excess ammonium hydroxide giving an inky blue solution. What is the cation
(positive ion) present in solution B ? What is the probable colour of solution B ?
(b) When an ammonium salt is warmed with sodium hydroxide solution, ammonia gas is evolved. State
three ways in which you could identify this gas ?
(c) Complete the following equations. What property of ammonia is illustrated by the reaction in (iii)b ?
(1) Mg3N2 + 6H2O "
(2) 2NH3 + 3CuO "
(3) 8NH3 + 3Cl2 "
(4) 4NH3 + 5O2 "
(d) What important process starts with the reaction in (iii-d) above ? Name the catalyst used ?
(e) During the laboratory preparation, how is ammonia dried and collected.

(ii) Match the following column-A with column-B

Column-A Column-B
(i) Aluminium carbide and water (a) Ethyne
(ii) Calcium carbide and water (b) Ethanol
(iii) Ethene and water (c) Ethanal
(iv) Ethyne and water (d) Ethene
(v) Ethyl bromide and alcoholic KOH (e) Methane

(iii) Complete the following by choosing the correct answers from the bracket:
(a) Metals are good _____ (oxidising agents/reducing agents) because they are electron _____
(acceptors/ donors).
(b) In covalent compounds, the bond formed is due to the _____ (sharing/transfer) of electrons.
(c) Bronze is an alloy of _____ and Copper.
(d) Conversion of ethene to ethane is an example of______(hydration/hydrogenation).
(e) Hydrogen chloride gas is not dried using______ (conc. H2 SO 4 , CaO)

(iv) Identify the following:

(a) Compounds which conduct electricity in molten state.
(b) Acid added during electrolysis of water.
(c) The type of electricity used during electrolysis.
(d) Electrolyte used in silver plating.
(e) The experiment which demonstrates extreme solubility of Hydrogen chloride gas.

(v) Give one example each of :

1. Cracking
2. Hydrogenation
3. Dehydration
4. Substitution reaction
5. Addition reaction.
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SECTION - B
(Attempt any four questions.)

QUESTION 3.

(i) Name a substance used for

(a) illuminating country houses
(b) making a household plastic material

(ii) Identify the acid which matches the following description (a) to (b) :
(a) The acid which produces sugar charcoal from sugar.
(b) The acid on mixing with lead nitrate solution produces a white precipitate which is insoluble even on
heating.

(iii) The atomic numbers of three elements A, B and C are given below :

Element Atomic number

A 5
B 7
C 10
(a) Which element belongs to group zero?
(b) Which element belongs to group VA ?
(c) Which element belongs to group MA?

(iv) A metal, whose alloy finds use in the construction of aircraft, in the powdered form was added to sodium
hydroxide solution. A colourless gas was evolved and after the reaction was over, the solution was colourless.
(a) Name the powdered metal added to sodium hydroxide solution.
(b) Name the gas evolved.
(c) Name the salt present in colourless solution.

QUESTION 4.

(i) Answer the following questions based on the extraction of aluminium from alumina by Hall-Heroult’s
Process:
(a) What is the function of cryolite used along with alumina as the electrolyte ?
(b) Why is powdered coke sprinkled on top of the electrolyte ?

(ii) How much calcium oxide is formed when 82 g of calcium nitrate is heated? Also find the volume of nitrogen
dioxide evolved:
2Ca(NO3)2 $ 2CaO + 4NO2 + O2
(Ca = 40, N = 14, O =16)

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ICSE 10th Chemistry Sample Paper 16 Page 5

(iii) (a)
(1) Which feature of the Ammonia molecules leads to the formation of Ammonium ion when Ammonia
dissolves in Water ?
(2) Name the other ion formed when Ammonia dissolves in Water.
(3) Give one test that can be used to detect the presence of the ion produced in (a) (2).
(b) Write the equations for the following reactions which result in the formation of Ammonia:
(1) A mixture of Ammonium chloride and Slaked lime is heated.
(2) Aluminium nitride and Water.

(iv) Laboratory preparation of hydrogen chloride gas :

(a) Write the equation for its preparation mentioning the condition required.
(b) Name the drying agent used and justify your choice.
(c) State a safety precaution you would take during the preparation of hydrochloric acid.

QUESTION 5.

(i) Explain why dry or liquid ammonia is neutral to litmus.

(ii) Write equations for each of the following reactions:

(a) Chlorine is passed over heated iron.
(b) Copper sulphate solution is added to sodium hydroxide solution.

(iii) Aman, a student in a chemistry lab, is tasked with performing three different reactions and needs to write
the balanced chemical equations for each one. Based on the instructions provided, Aman needs to complete
the following:
(a) Copper carbonate is treated with sulphuric acid.
(b) Sodium nitrate is heated at 200°C with sodium bisulphate.
(c) Zinc hydroxide is heated in presence of sodium hydroxide.

(iv) (a) Write the equation for the preparation of ethylene from ethyl alcohol.
(b) Write the general formula for a saturated hydrocarbon and give one example of saturated hydrocarbon
with its structural formula.
(c) Name a compound which will give acetylene gas when treated with water.

QUESTION 6.

(i) How are molecular formula and empirical formula related to each other ?

(ii) (a) Write a balanced chemical equation for the following reaction :
Reduction of copper (II) oxide by hydrogen.
(b) What happens to the crystals of washing soda when exposed to air? Name the phenomenon exhibited.

(iii) (a) Name the metals extracted by electrolysis.

(b) Name the compounds from which these metals are extracted.
(c) What is the state of the compounds from which these metals are extracted?

(iv) (a) Electrolyte used for electroplating with nickel is______. [NiSO4/NiCl2/Ni(OH)2]
(b) Electrolyte used for electroplating with silver is______. [AgCl2/Ag(NO3)2/Na[Ag(CN)2]
(c) The compound which gives oxygen on heating is______. [HgO/Na2O/CaO]

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QUESTION 7.

(i) Give IUPAC names of the following:

(a) CH 3 CH 2 CH 2 OH (b) (c) CH 3 - C / CH

(ii) Name the following :

(a) A basic solution which does not contain a metallic element.
(b) An alkali which on dissociation produces a high concentration of hydroxyl ions.
(c) A complex salt solution used for testing a basic gas lighter than air.

(iii) Mohit, a chemistry student, is performing an experiment involving potassium nitrate and sulphuric acid
as shown in the figure. He observes the product formed and needs to analyze and answer the following
questions based on the setup.

(a) What is the ratio of potassium nitrate and sulphuric acid ?

(b) Give the reaction which takes place in the above retort.
(c) Why product obtained is yellow in colour ?
(d) How can this yellow colour be removed? Why is temperature maintained below 200cC ?

QUESTION 8.

(i) How would you distinguish between Zn2+ and Pb2+ using ammonium hydroxide solution ?

(ii) What is lone pair effect ? In what kind of compound does this effect occur ?

(iii) Choose the property of sulphuric acid (A, B, C, or D), which is relevant to each of the following :
A : Dil. acid (typical acid properties)
B : Non-volatile acid
C : Oxidising agent
D : Dehydrating agent.
(1) Preparation of hydrogen chloride
(2) Preparation of ethene from ethanol
(3) Preparation of copper sulphate from copper oxide.

(iv) State one relevant observation for each of the following reactions
(a) At the anode, when aqueous copper sulphate solution is electrolysed using copper electrodes.
(b) Ethyl alcohol vapours is passed through a tube containing alumina at 300°C.
(c) Ethene is bubbled through a solution of bromine in tetrachloromethane.

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ICSE 10th Chemistry Sample Paper 17 Page 1

Sample Paper 17
ICSE Examination Class X 2024-25
Chemistry
Science Paper - 2
Time: 2 Hours Max. Marks: 80
General Instructions:
1. Answer to this Paper must be written on the paper provided separately.
2. You will not be allowed to write during first 15 minutes.
3. This time is to be spent in reading the question paper.
4. The time given at the head of this Paper is the time allowed for writing the answers.
5. Section A is compulsory. Attempt any four questions from Section B.

SECTION - A
(Attempt all questions from this Section.)

QUESTION 1.
Choose the correct answers to the questions from the given options.
(Do not copy the questions, write the correct answer only.)

(i) In an industrial workshop, Priya is tasked with electroplating an iron nail with copper to improve its
appearance and resistance to corrosion. Which apparatus could she use to successfully electroplate the iron
nail with copper?

= Copper sheet, = Iron nail

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(ii) The salt in which the solution gives a pale green precipitate with sodium hydroxide solution and a white
precipitate with barium chloride solution is
(a) iron (III) sulphate (b) iron (II) sulphate
(c) iron (II) chloride (d) iron (III) chloride

(iii) If an element A belongs to period 3 and Group II then it will have :

(a) 3 shells and 2 valence electrons (b) 2 shells and 3 valence electrons
(c) 3 shells and 3 valence electrons (d) 2 shells and 2 valence electrons

(iv) A sample of soil is mixed with water and allowed to settle. The clean supernatant solution turns the pH
paper yellowish-orange. Which of the following would change the colour of this pH paper to greenish-blue?
(a) Lemon juice (b) Antacid
(c) Common salt (d) Vinegar

(v) Which one of the following elements exhibit maximum number of valency electrons?
(a) P (b) Al
(c) Si (d) Na

(vi) Which of the following relation for E.F is correct :

(a) E.F = M.M # n

2 (b) E.F # M.M = n
(c) M.M # n = E.F (d) E.F = M.M
n

(vii) Assertion: Copper hydroxide (Cu(OH)2) is not an alkali.

Reason: An alkali is a soluble base. Copper hydroxide is not soluble in water, unlike calcium hydroxide,
ammonium hydroxide, and sodium hydroxide.
(a) Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.
(b) Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
(c) Assertion is true, but Reason is false.
(d) Assertion is false, but Reason is true.

(viii) The most distinctive property of the noble gases is that they are:
(a) Metallic (b) Unreactive
(c) Radioactive (d) Metalloid

(ix) The brown ring test is used for detection of :

(a) NO-3 (b) CO 2-
3
(c) SO 2-
3 (d) Cl-

(x) Number of shells across the period:

(a) Remains same (b) Decreases
(c) Increases (d) All of above

(xi) Black insoluble compound which on reacting with nitric acid turns into blue solution.
(a) Zinc Oxide [NH4NO3] (b) Ferric Oxide Fe2O3
(c) Titanium Oxide TiO2 (d) Copper Oxide CuO

(xii) The alkanes in which carbon atoms are not a continous chain are called .......... .
(a) structured (b) branched
(c) unsymmetric (d) symmetric

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ICSE 10th Chemistry Sample Paper 17 Page 3

(xiii) The salt solution which does not react with ammonium hydroxide is :
(a) Calcium Nitrate (b) Zinc Nitrate
(c) Lead Nitrate (d) Copper Nitrate

(xiv) Liquid ammonia is used for refrigeration because it

(a) has a high dipole moment (b) is basic
(c) has a high heat of vaporisation (d) is a stable compound

(xv) Assertion: On moving from left to right in a period in the periodic table, the size of the atom decreases.
Reason: As the number of protons (nuclear charge) increases across a period, the stronger attraction
between the nucleus and electrons pulls the electrons closer, reducing the atomic radius.
(a) Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.
(b) Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
(c) Assertion is true, but Reason is false.
(d) Assertion is false, but Reason is true.

(xvi) On moving from left to right in a period in the periodic table, the size of the atom.
(a) decreases. (b) increases.
(c) does not change appreciably. (d) first decreases and then increases.

QUESTION 2.

(i) (a) Name the method used for obtaining ammonia on a large-scale.
(b) What is the actual ratio of the reactants?
(c) Are the reactants necessarily taken in the same ratio ? Explain.
(d) The temperature used is 450°C. Explain why
(1) A lower temperature is not used.
(2) A higher temperature is not used.

(ii) Match the following column-A with column-B

Column-A Column-B
(1) Promoter used in Haber’s process (a) 800° C
(2) Catalyst used in oxidation of ammonia (b) K2HgI4
(3) Drying agent for ammonia (c) Molybdenum
(4) A solution which gives brown colouration with ammonium salts (d) Refrigent
(5) Temperature in Haber’s process (e) Platinum

(iii) Complete the following by choosing the correct answers from the bracket:
(a) The similarities in the properties of group of elements are because they have the same_____(electronic
configuration, number of outer electrons, atomic numbers).
(b) The acid which cannot act as an oxidizing agent is______. (conc. H2SO4, conc. HNO3, conc. HCl).
(c) Steel is an alloy of _____ (pure iron, pure zinc) and Carbon.
(d) Pure anhydrous acid is a _____ conductor of electricity. (good/bad)
(e) Aqueous solution of hydrogen chloride is ______ (basic/acidic).

(iv) Identify the following:

(a) Electrolytic deposition of a superior metal on a baser metal.
(b) Agents which conduct electricity in a conductor.

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(c) Process of extraction of metals from its ores by electrolysis.

(d) The process by which an electrovalent compound breaks up into mobile ions.
(e) The gas obtained when rock salt reacts with conc. Sulphuric acid.

(v) The molecules of alkene family are represented by a general formula CnH2n. Now answer the following :
(a) What do n and 2n signify ?
(b) What is the name of alkene when n = 4 ?
(c) What is the molecular formula of alkene when n = 6 ?
(d) What is the molecular formula of the alkene if there are six H-atoms in it ?
(e) What is the molecular formula and structural formula of the first member of the alkene family ?

SECTION - B
(Attempt any four questions.)

QUESTION 3.

(i) List three characteristics of isomers.

(ii) Which property of sulphuric acid is shown by the reaction of concentrated sulphuric acid with :
(a) Ethanol ?
(b) Carbon ?

(iii) What are the following groups known as ? Give two examples of each.
(a) Group IA elements
(b) Group VII A elements
(c) Group zero elements.

(iv) (a) Outline the steps required to convert hydrogen chloride to anhydrous iron (III) chloride. Write the
equation(s) for the reaction(s) which take place.
(b) (1) What are the two steps to change lead carbonate to lead chloride?
(2) Give the name of a soluble salt of lead and write the equation for the action of heat on this salt.

QUESTION 4.

(i) (a) Give the chemical name and formula of cryolite.

(b) Complete and balance the following equation:
Al + NaOH + ______ $

(ii) Calculate the percentage of :

(1) Fluorine
(2) Sodium and
in sodium aluminium fluoride [Na3AlF6], to the nearest whole number.
[Atomic Mass : Na = 23, Al = 27, F = 19]

(iii) List the properties of ammonia that make it :

(1) A good refrigerant
(2) A cleaning agent
(3) As a source of hydrogen.

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ICSE 10th Chemistry Sample Paper 17 Page 5

(iv) Write the equation for the following reactions.

(a) Calcium carbide and water
(b) Ethene and water (steam)
(c) Bromoethane and an aqueous solution of sodium hydroxide.

QUESTION 5.

(i) (a) Though Ammonium nitrite readily gives Nitrogen on heating, a mixture of Ammonium chloride and
Sodium nitrite in water is heated to prepare Nitrogen in the laboratory.
(b) Ammonia cannot be collected over water.

(ii) (a) What do you understand by dibasic acid? Give an example.

(b) How many types of salts does dibasic acid produce when it reacts with caustic soda solution ? Give
equations.

(iii) (a) State whether the following statements are True of False. Justify your answer.
(1) According to Mendeleev, periodic properties of elements are periodic function of their atomic
number.
(2) Atomic number is equal to the number of protons.
(b) Calculate volume of O2 at S.T.P. required for the complete combustion of 10 litres of carbon monoxide
at the same temperature and pressure.

(iv) During a quality control test in a chemical factory, Mr. Arjun is required to monitor and record the
observations when dilute hydrochloric acid is added to various compounds. Based on his experiment, answer
the following questions:
(1) What observation does Mr. Arjun note when dilute hydrochloric acid is added to lead nitrate solution
and the mixture is heated?
(2) What reaction does he observe when dilute hydrochloric acid is added to copper carbonate?
(3) What does Mr. Arjun observe when dilute hydrochloric acid is added to sodium thiosulphate?

QUESTION 6.

(i) What is the volume (in litres) at S.T.P. of

(a) 16 g of Methane gas?
(b) 0.14 g of Carbon monoxide gas?

(ii) (a) Name the ions furnished by an acid.

(b) Name two crystalline substances which don’t contain water of crystallisation.

(iii) During an electrolysis experiment in the chemistry lab, Rahul observes the setup and reactions in different
scenarios. Based on his observations, answer the following questions:
(a) Study the diagram given below and answer the questions that follow :

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Page 6 Sample Paper 17 NODIA

(1) Give the names of the electrodes A and B.

(2) Which electrode is the oxidising electrode?
(b) A strip of copper is placed in four different colourless salt solutions. They are KNO3, AgNO3, Zn(NO3)2,
Ca(NO3)2. Which one of the solutions will finally turn blue ?
(c) Write the equations of the reactions which take place at the cathode and anode when acidified water is
electrolysed.

(iv) (a) Positive electrode is called the_______.

(b) The electron releasing tendency of zinc is______ than that of copper.
(c) The conductivity of an electrolyte _____with rise in temperature.

QUESTION 7.

(i) Write balanced chemical equations:

(a) Addition of Hydrogen to Ethyne.
(b) Burning of Methane in sufficient supply of air.
(c) Burning of Ethane in sufficient supply of air.

(ii) In an industrial lab, Mr. Kapoor is tasked with carrying out different chemical reactions. Based on his
observations, answer the following questions:
(a) What is the balanced chemical equation when dilute nitric acid reacts with copper carbonate?
(b) Write the balanced equation for the reaction between silver nitrate solution and sodium chloride solution.
(c) What is the balanced chemical equation for the reaction between zinc sulphide and dilute sulphuric
acid?

(iii) What happens when (give balanced equation):

(a) Sulphur is added to hot and conc. HNO3 ?
(b) Nitric acid is added to KI (aq) ?
(c) Sodium hydrogen carbonate is added to nitric acid ?
(d) Nitric acid is dissolved in large amount of water ?

QUESTION 8.

(i) State one relevant observation for .the following :

Lead nitrate solution is treated with sodium hydroxide solution drop wise till it is in excess.

(ii) How many covalent and coordinate bonds are present in :

(a) Hydronium ion
(b) Ammonium ion.

(iii) You are given the three white powders, calcium carbonate, lead carbonate and zinc carbonate. Describe the
tests you would carry out in solution to identify the metal in each of the above compounds. Indicate clearly
how you would prepare the solutions for the tests.

(iv) Arrange the following as per the instruction given in the brackets.
(a) C, Pb, Sn, Ge, Si (increasing order of non-metallic character).
(b) Na, Al, Cl (increasing order of ionisation potential).
(c) Zn2+, Na+, Cu2+ (order of preference of discharge at the cathode).

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