ICSE Class 10

General instructions: Answer all questions. Marks are shown in brackets [ ].

Objective

1. 1.
   Nitroglycerine and trinitrotoluene are :

   1. A. Fibres
   2. B. Fertilisers
   3. C. Detergents
   4. D. Explosives
   [1]
2. 2.
   A compound which on hydrolysis will give two acids

   1. A. Ferrous chloride
   2. B. Sulphuryl chloride
   3. C. Nitrosyl chloride
   4. D. Ferrous nitrate
   [1]
3. 3.
   The oxidising agent in the equation, S + 2H₂SO₄ (conc.) → 3SO₂ + 2H₂O is:

   1. A. S
   2. B. H₂SO₄
   3. C. SO₂
   4. D. H₂O
   [1]
4. 4.
   Dilute sulphuric acid will produce a white precipitate when added to a solution of :

   1. A. copper nitrate
   2. B. zinc nitrate
   3. C. Lead nitrate
   4. D. sodium nitrate
   [1]
5. 5.
   (i) Choose the correct answer from the options given below: The catalyst used in the Contact Process is:

   1. a. Copper
   2. b. Iron
   3. c. Vanadium pentoxide
   4. d. Manganese dioxide
   [3]
6. 6.
   Which gas is obtained when ethanol undergoes dehydration?

   1. A. Ethane
   2. B. Ethene
   3. C. Ethyne
   4. D. Methane
   [1]
7. 7.
   Which balanced chemical equation correctly shows the action of dilute sulphuric acid on zinc sulphide?

   1. A. ZnS + H₂SO₄ → ZnSO₄ + H₂S
   2. B. ZnS + H₂SO₄ → ZnO + SO₂ + H₂
   3. C. ZnS + 2H₂SO₄ → ZnSO₄ + SO₂ + 2H₂O
   4. D. ZnS + H₂SO₄ → Zn + H₂S + SO₃
   [1]
8. 8.
   Which balanced chemical equation correctly represents the action of dilute sulphuric acid on sodium sulphite?

   1. A. Na₂SO₃ + H₂SO₄ → Na₂SO₄ + H₂O + SO₂↑
   2. B. Na₂SO₃ + 2 H₂SO₄ → Na₂SO₄ + 2 H₂O + 2 SO₂
   3. C. Na₂SO₃ + H₂SO₄ → Na₂O + H₂O + 2 SO₂
   4. D. 2 Na₂SO₃ + H₂SO₄ → 2 Na₂SO₄ + H₂O + SO₂
   [1]
9. 9.
   Which reagent from the list—

   1. A. Ammonium hydroxide
   2. B. Barium chloride
   3. C. Sodium chloride
   4. D. Sodium hydroxide
   [1]
10. 10.
    Why is concentrated sulphuric acid unsuitable as a drying agent for hydrogen sulphide gas?

    1. A. It absorbs H₂S without reacting, making it ineffective.
    2. B. It reacts with H₂S to produce sulphur and sulphur dioxide.
    3. C. It decomposes H₂S into hydrogen and sulphur at room temperature.
    4. D. It forms a stable complex with H₂S, preventing drying.
    [1]
11. 11.
    When using sulphuric acid to prepare other acids, which specific property of sulphuric acid is utilized?

    1. A. High solubility in water
    2. B. Strong oxidizing ability
    3. C. Least volatile acid
    4. D. High viscosity
    [1]
12. 12.
    Corrosive action of $\mathrm{H_2SO_4}$ on skin is due to its :

    1. A. Oily nature
    2. B. Exothermic nature
    3. C. Volatile nature
    4. D. Dehydrating character
    [1]
13. 13.
    Corrosive action of sulphuric acid on skin is due to its:

    1. A. Oxidising nature
    2. B. Volatile nature
    3. C. Reducing nature
    4. D. Dehydrating nature
    [1]
14. 14.
    In the contact process for the manufacture of sulphuric acid, which pair of equations correctly represents the conversion of sulphur trioxide to sulphuric acid?

    1. A. SO₃ + H₂O → H₂SO₄
    2. B. SO₃ + H₂SO₄ (conc.) → H₂S₂O₇; H₂S₂O₇ + H₂O → 2 H₂SO₄
    3. C. 2 SO₃ + H₂O → H₂S₂O₇
    4. D. SO₃ + 2 H₂O → H₂SO₄ + H₂
    [1]
15. 15.
    Why is sulphuric acid used in large quantities in the iron and steel industry?

    1. A. To increase the hardness of iron and steel products.
    2. B. To remove the oxide coating from the surface before plating or enameling.
    3. C. To enhance the magnetic properties of steel.
    4. D. To prevent rusting by forming a protective layer.
    [1]
16. 16.
    In the preparation of carbon monoxide from oxalic acid, what is the role of concentrated sulphuric acid?

    1. A. Acts as a reducing agent to produce CO gas
    2. B. Acts as a dehydrating agent to remove water from oxalic acid
    3. C. Acts as a catalyst to speed up the decomposition of oxalic acid
    4. D. Acts as an oxidizing agent to convert oxalic acid to CO₂
    [1]
17. 17.
    Which pair of equations correctly illustrates concentrated sulphuric acid acting as an oxidizing agent and as a non-volatile acid?

    1. A. Cu + H₂SO₄ → CuO + H₂O + SO₂; NaCl + H₂SO₄ → NaHSO₄ + HCl
    2. B. Cu + 2H₂SO₄ → CuSO₄ + 2H₂O + SO₂; NaNO₃ + H₂SO₄ → NaHSO₄ + HNO₃
    3. C. Zn + H₂SO₄ → ZnSO₄ + H₂; CaCO₃ + H₂SO₄ → CaSO₄ + H₂O + CO₂
    4. D. Fe + H₂SO₄ → FeSO₄ + H₂; KNO₃ + H₂SO₄ → KHSO₄ + HNO₃
    [1]
18. 18.
    Assertion (A): In the Contact Process, SO₂ gas is not directly dissolved in water to obtain sulphuric acid. Reason (R): Dense fog or misty droplets of sulphuric acid are formed, which is difficult to condense. Which of the following is correct?

    1. A. Both (A) and (R) are true, and (R) is the correct explanation of (A).
    2. B. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
    3. C. Only (A) is true, but (R) is false.
    4. D. Only (R) is true, but (A) is false.
    [1]
19. 19.
    Which set of chemical equations correctly outlines the key steps in the manufacture of sulphuric acid by the contact process?

    1. A. S + O₂ → SO₂; 2 SO₂ + O₂ ⇌ 2 SO₃ (V₂O₅); SO₃ + H₂O → H₂SO₄
    2. B. S + O₂ → SO₂; 2 SO₂ + O₂ ⇌ 2 SO₃ (V₂O₅); SO₃ + H₂SO₄ → H₂S₂O₇; H₂S₂O₇ + H₂O → 2 H₂SO₄
    3. C. FeS₂ + O₂ → Fe₂O₃ + SO₂; SO₂ + O₂ → SO₃; SO₃ + H₂O → H₂SO₄
    4. D. S + O₂ → SO₃; SO₃ + H₂O → H₂SO₄ (Pt catalyst)
    [1]
20. 20.
    Which of the following represents the correct chemical equation when dilute sulphuric acid is poured over sodium sulphite?

    1. A. Na₂SO₃ + H₂SO₄ → Na₂SO₄ + H₂O + SO₂↑
    2. B. Na₂SO₃ + H₂SO₄ → Na₂S + H₂O + O₂
    3. C. Na₂SO₃ + H₂SO₄ → Na₂SO₄ + H₂S + O₂
    4. D. Na₂SO₃ + H₂SO₄ → NaHSO₄ + H₂O + SO₃
    [1]