ICSE 2022 Chemistry Question Paper Solved Semester 2 for Class 10

Solving ICSE Class 10 Chemistry Previous Year Question Papers ICSE Class 10 Chemistry Question Paper 2022 Semester 2 is the best way to boost your preparation for the board exams.

ICSE Class 10 Chemistry Question Paper 2022 Solved Semester 2

Time: 1½ hour
Maximum Marks: 40

General Instructions:

Answers to this Paper must be written on the paper provided separately.
You will not be allowed to write during the first 10 minutes.
This time is to be spent in reading the question paper.
The time given at the head of this Paper is the time allowed for writing the answers.
Attempt all questions from Section A and any three questions from Section B.
The marks intended for questions are given in brackets [].

Section – A
(Attempt all questions)

Question 1.
Choose the correct answers to the questions from the given options. (Do not copy the question. Write the correct answer only.) [10]
(i) The ore of Aluminium is :
(a) Calamine
(b) Haematite
(c) Magnetite
(d) Cryolite
Answer:
(d) Cryolite (Na₃AlF₆)

(ii) Hydrogen chloride gas is not collected over water, as :
(a) It is highly soluble in water.
(b) It is less soluble in water.
(c) It is lighter than air.
(d) It is heavier than air.
Answer:
(a) Hydrogen chloride gas is highly soluble in water

(iii) An aqueous solution of ammonia is :
(a) Neutral
(b) Acidic
(c) Basic
(d) Amphoteric
Answer:
(c) NH₃ + H₂O ⇌ NH₄OH (Basic solution)

(iv) The acid which is least volatile is :
(d) Hydrochloric acid
(b) Nitric acid
(c) Dilute sulphuric acid
(d) Concentrated sulphuric acid
Answer:
(d) Conc. sulphuric acid is oily viscous liquid acid, which is least volatile.

(v) The gas formed, when calcium bisulphite reacts with dilute HNO₃:
(a) Sulphur trioxide
(b) Hydrogen
(c) Sulphur dioxide
(d) Hydrogen sulphide
Answer:
(c) Ca(HSO₃)₂ + 2HNO₃ → Ca(NO₃)₂ + 2H₂O + 2SO₂↑

(vi) The 1UPAC name of formic acid :
(a) Propanoic acid
(b) Methanoic acid
(c) Ethanoic acid
(d) Butanoic acid
Answer:
(b) HCOOH
Methanoic acid

(vii) The metallic oxide which when reacts with HCl forms salt and water :
(a) Carbon monoxide
(b) Nitrous oxide
(c) Ammonium hydroxide
(d) Sodium oxide
Answer:
(d)

(viii) Vanadium pentoxide is used as a catalyst in the preparation of:
(a) Nitrogen gas
(b) Nitrogen dioxide gas
(c) Sulphur trioxide gas
(d) Carbon dioxide gas
Answer:
(c) Vanadium pentoxide (V₂O₅) act as a catalyst in Contact process. It is a process used to prepare sulphur trioxide.

(ix) The Catalyst used for the conversion hydroxide of Ethene to Ethane:
(a) Iron
(b) Nickel
(c) Cobalt
(d) Molybdenum
Answer:
(b)

(x) Substance which helps to lower the fusion point of the mixture in Hall Heroult Process:
(a) Coke
(b) Concentrated sodium hydroxide
(c) Fluorspar
(d) Concentrated potassium
Answer:
(c) (c) Fluorspar is used in Hall Heroult process to lower the fusion point of the mixture

Section – B
(Attempt any three questions from this Section)

Question 2.
(i) Define: [2]
(a) Isomerism
(b) Ores
Answer:
(a) Isomerism: The process in which the compounds having same molecular formula exist in two or more forms having different structural formula.

(b) Ores: The naturally occurring solid material from which a metal or valuable mineral can be profitably extracted.

(ii) Name the following:
(a) The property by which carbon links with itself to form a long chain.
(b) The saturated hydrocarbons having general formula C_nH_2n-2.
Answer:
(a) Catenation.
(b) This question will have dual answer. Saturated compounds have single bond. Unsaturated compounds have double and triple bond. C_nH_2n-2 → This formula refers to alkynes.

(iii) Draw the structural diagram of: [3]
(a) pentanal
(b) propanol
(c) 2-Butene
Answer:

(iv) Complete and balance the following chemical equations : [3]
(a)

(b) C₂H₆ + O₂ [excess] →
(c) CH₄ + O₂ [excess] →
Answer:
(a)

(b) C₂H₆ + \(\frac{7}{2}\) O₂ → 2CO₂ + 3H₂O
2C₂H₆ + 7O₂ → 4 CO₂ + 6H₂O

Question 3.
(i) State the following : [2]
(a) A compound formed when excess ammonia gas reacts with chlorine.
(b) A substance added to water, to manufacture sulphuric acid in Contact process.
Answer:
(a) Ammonium chloride
[8NH₃ + 3Cl₂ → 6NH₄Cl + N₂]

(b) Oleum (H₂S₂O₇)
[H₂S₂O₇ + H₂O → 2H₂SO₄]

(ii) Identify the gas P and Q in the reactions given below : [2]
(а) A compound reacts with an acid to form gas P which has no effect on acidified K₂Cr₂O₇ solution but turns lime water milky.
(b) A metallic nitrate reacts on heating gives oxygen gas along with a coloured gas Q.
Answer:
(a) P is carbon dioxide (CO₂)

(b) Q is Nitrogen dioxide (NO₂)

(iii) State the observation for the following : [3]
(a) Dry ammonia gas reacts with oxygen in the presence of a catalyst.
(b) Excess chlorine gas reacts with ammonia gas.
(c) Carbon reacts with hot concentrated nitric acid.
Answer:
(a) Reddish brown fumes of nitrogen dioxide gas are observed.

(b) Yellow explosive liquid (NCl₃) is formed.
NH₃ + 3Cl₂ → NCl₃ (Yellow explosive liquid) + 3HCl

(iv) Write balanced equation for the following conservations : [3]
(a) Carbon from cane sugar and concentrated sulphuric acid.
(b) Ferric nitrate from ferric hydroxide and nitric acid.
(c) Ammonium sulphate from ammonium hydroxide and Sulphuric acid.
Answer:

Question 4.
(i) State the relevant reason for the following: [2]
(a) Concentrated alkali is used for the concentration of bauxite ore.
(b) Fused alumina is reduced to aluminium by electrolysis.
Answer:

(a) Concentrated alkali is used for the concentration of bauxite ore because it dissolves aluminium oxide forming soluble sodium aluminate and impurities are left insoluble and can be separated.

(b) Alumina is a very stable compound. Aluminium is more reactive than carbon and it has more affinity for oxygen, therefore, alumina cannot be reduced with carbon but is extracted by electrolytic reduction.

(ii) State one use of the given alloys : [2]
(a) Magnalium
(b) Duralumin
Answer:
(a) Magnalium: It is used for making scientific instruments.
(b) Duralumin: It is used for making aircraft structures.

(iii) Complete the table given below which refers to the Laboratory preparation of Ammonia gas: [3]

Answer:
(a) Sal ammoniac and slaked lime
(NH₄Cl and Ca(OH)₂)
(b) Calcium oxide
(c) Downward displacement of air

(iv) Identify the terms for the following : [3]
(a) The process used to purify Alumina by electrolytic reduction.
(b) The experiment used to demonstrate the high solubility of HC1 gas.
(c) The chemical property of sulphuric acid to form two types of salts with an alkali.
Answer:
(a) Baeyer’s process (Purification of Alumina) Halls and Herault process
(b) Fountain experiment
(c) Dibasic acid

Question 5.
(i) Write the balanced chemical equation for the following : [2]
(a) Action of heat on manganese dioxide and concentrated hydrochloric acid.
(b) Zinc reacts with dilute hydrochloric acid to form zinc chloride.
Answer:
(a)

(b) Zn + 2HCl → ZnCl₂ + H₂ ↑

(ii) Select the right answer from the brackets and complete the statements: [2]
In electrolysis of fused Alumina, the anode is made of (a) ……….. [gas carbon/graphite] and the product formed at cathode is (b) ………….. [oxygen/aluminium].
Answer:
(a) graphite
(b) aluminium

(iii) Give the IUPAC name for the following: [3]

Answer:
(a) Ethene.
(b) Propanal.
(c) 3 methyl pentane.

(iv) Study the diagram, which shows the Brown Ring Test and answer the question given below : [3]

(a) Which ion is determined by Brown Ring Test ?
(b) Why is freshly prepared iron [II] sulphate used in the test ?
(c) Name the substance Z.
Answer:
(a) Nitrate.
(b) Because on exposure to atmosphere it is oxidised to ferric sulphate which does not give brown ring test.
(c) Z is concentrated sulphuric acid.

Question 6.
(i) Distinguish between the following as directed:
(a) Sodium sulphite solution and sodium sulphate solution. [using dilute H₂SO₄]
(b) Lead salt solution and zinc salt solution
[using NH₄OH solution in excess]
Answer:
(a) Na₂SO₃ + H₂SO₄ → Na₂SO₄ + H₂O + SO₂↑
Na₂SO₄ + H₂SO₄ No reaction
Sodium sulphite on reaction with sulphuric acid liberates a pungent-smelling gas sulphur dioxide whereas sodium sulphate does not show any reaction.

(b) PbCl₂ + 2NH₄OH → Pb(OH)₂↓(Chalky white precipitates) + 2NH₄Cl
ZnCl₂ + 2NH₄OH → Zn(OH)₂ + 2NH₄Cl
Zn(OH)₂ + 2NH₄Cl + 2NH₄OH →
[Zn(NH₃)₄ (Soluble complex)] Cl₂ + 4H₂O
Lead salt solution forms white precipitates with excess of ammonium hydroxide whereas zinc salts forms soluble complex.

(ii) Give one word for the following statements:
(a) The compounds of various metals found in nature with ear impurities.
(b) A homogeneous mixture of two or more metals or a metal and a non-metal in specific ratios.
Answer:
(a) Minerals
(b) Alloys

(iii) Identify the acid in each case : [3]
(а) The acid formed when Sulphur reacts with concentrated nitric acid.
(b) An acid, which on adding to lead nitrate solution produces a white precipitate which is soluble on heating.
(c) The acid formed when potassium nitrate reacts with a least volatile acid.
Answer:
(a) Sulphuric acid
[S + 6HNO₃ → H₂SO₄ + 2H₂O + 6NO₂]

(b) Hydrochloric acid
[Pb (NO₃)₂ + 2HCl → PbCl₂ + 2HNO₃]

(iv) Match column A with column B: [3]

Name (A)	Functional group (B)
1. Aldehyde	(a) -OH
2. Carboxylic acids	(b) -CHO
3. Alcohol	(c) -COOH

Answer:
1. Aldehyde – CHO
2. Carboxylic acids – COOH
3. Alcohol – OH