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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