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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