ICSE Class 10

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

Objective

1. 1.
   (XII) What is the balanced chemical equation for the reaction between hydrogen and chlorine?

   1. A. H₂ + Cl₂ → HCl
   2. B. H₂ + Cl₂ → 2HCl
   3. C. H₂ + 2Cl₂ → 2HCl
   4. D. 2H₂ + Cl₂ → 2HCl
   [1]
2. 2.
   Which gas is evolved when potassium sulphite is treated with dilute hydrochloric acid?

   1. A. Hydrogen sulphide
   2. B. Sulphur dioxide
   3. C. Chlorine
   4. D. Carbon dioxide
   [1]
3. 3.
   (XV) What is the balanced chemical equation for the reaction between zinc and hydrochloric acid?

   1. A. Zn + HCl → ZnCl + H
   2. B. Zn + 2HCl → ZnCl₂ + H₂
   3. C. Zn + HCl → ZnCl₂ + H
   4. D. 2Zn + HCl → Zn₂Cl + H₂
   [1]
4. 4.
   Why is hydrogen chloride not collected over water?

   1. A. It is lighter than air.
   2. B. It is highly or extremely soluble in water.
   3. C. It reacts violently with water.
   4. D. It is a non-polar gas.
   [1]
5. 5.
   Why does hydrogen chloride gas produce fumes in moist air?

   1. A. It reacts with nitrogen in the air to form ammonia
   2. B. It reacts with atmospheric water vapour to form hydrochloric acid fumes
   3. C. It decomposes into hydrogen and chlorine gas
   4. D. It absorbs moisture and turns into a liquid
   [1]
6. 6.
   (i) Manganese(IV) oxide, Lead(IV) oxide, Potassium permanganate, Potassium dichromate are commonly called as

   1. A. reducing agents
   2. B. oxidizing agents
   3. C. least volatile acids
   4. D. organic compounds
   [1]
7. 7.
   Why are thick white fumes formed when a glass rod dipped in NH₄OH is brought near the mouth of a bottle full of HCl gas?

   1. A. HCl gas reacts with ammonia from NH₄OH to form ammonium chloride, which appears as thick white fumes.
   2. B. HCl gas combines with water vapor in the air to produce white fumes of hydrochloric acid.
   3. C. The reaction between HCl and NH₄OH releases chlorine gas, which forms white fumes.
   4. D. NH₄OH decomposes into ammonia and water, and the ammonia reacts with oxygen to form white fumes.
   [1]
8. 8.
   Why are calcium oxide and phosphorus pentoxide not used to dry hydrogen chloride gas?

   1. A. They absorb HCl gas without reacting
   2. B. They react chemically with HCl, forming new compounds
   3. C. They are insoluble in HCl gas
   4. D. They decompose HCl into hydrogen and chlorine
   [1]
9. 9.
   Which balanced equation represents the reaction of zinc with dilute hydrochloric acid?

   1. A. Zn + 2HCl(dil.) → ZnCl₂ + H₂↑
   2. B. Zn + HCl(dil.) → ZnCl + H₂↑
   3. C. Zn + 2HCl(dil.) → ZnH₂ + Cl₂↑
   4. D. Zn + HCl(dil.) → ZnO + H₂ + Cl₂
   [1]
10. 10.
    (XIII) Which of the following correctly represents the balanced chemical equation for the reaction between magnesium oxide and hydrochloric acid?

    1. A. MgO + HCl → MgCl + H₂O
    2. B. MgO + 2HCl → MgCl₂ + H₂O
    3. C. MgO + HCl → MgCl₂ + H₂
    4. D. 2MgO + HCl → Mg₂Cl + H₂O
    [1]
11. 11.
    Hydrogen chloride and water are examples of ______, and a solution of hydrogen chloride in water ______ free ions.

    1. A. polar covalent compounds, contains
    2. B. non-polar covalent compounds, contains
    3. C. polar covalent compounds, does not contain
    4. D. non-polar covalent compounds, does not contain
    [1]
12. 12.
    Choose the property of sulphuric acid (A, B, C, or D), which is relevant to each of the following: A

    1. A. Dilute acid (typical acid properties)
    2. B. Non-volatile acid
    3. C. Oxidising agent
    4. D. Dehydrating agent
    [3]
13. 13.
    Which balanced equation correctly represents the reaction of manganese(IV) oxide with concentrated hydrochloric acid?

    1. A. MnO₂ + 4HCl(conc.) → Δ MnCl₂ + 2H₂O + Cl₂
    2. B. MnO₂ + 2HCl(conc.) → Δ MnCl₂ + H₂O + Cl₂
    3. C. MnO₂ + 4HCl(conc.) → Δ MnCl₄ + 2H₂O
    4. D. MnO₂ + HCl(conc.) → Δ MnCl₂ + H₂O + O₂
    [1]
14. 14.
    Why is dilute hydrochloric acid not possible to concentrate by simple distillation?

    1. A. It forms a constant boiling mixture with water at 22.2% HCl by mass.
    2. B. HCl decomposes into hydrogen and chlorine gas when heated.
    3. C. Water evaporates first, leaving pure HCl behind.
    4. D. The solution becomes too dilute to distill effectively.
    [1]
15. 15.
    Phosphorus pentoxide and calcium oxide are good drying agents but they cannot be used to dry hydrogen chloride gas. Why?

    1. A. They react chemically with HCl, forming new compounds and destroying the gas.
    [1]
16. 16.
    Why is concentrated nitric acid not used in the preparation of hydrogen chloride gas?

    1. A. Concentrated nitric acid is volatile and contaminates the hydrogen chloride gas produced.
    2. B. Concentrated nitric acid reacts explosively with sodium chloride, the common reactant.
    3. C. Concentrated nitric acid is too weak to produce hydrogen chloride gas efficiently.
    4. D. Concentrated nitric acid forms a solid precipitate that blocks the apparatus.
    [1]
17. 17.
    A student wants to distinguish between manganese dioxide and copper(II) oxide using a chemical test. Which of the following observations would correctly identify manganese dioxide?

    1. A. Formation of a greenish-blue solution with no gas evolution
    2. B. Production of a greenish-yellow gas (chlorine) on heating with concentrated HCl
    3. C. Appearance of a white precipitate soluble in ammonium hydroxide
    4. D. Evolution of hydrogen gas when reacted with dilute HCl
    [1]
18. 18.
    Refer to the flow chart diagram below and identify the correct balanced equation with conditions, if any, for the conversion labelled **A**.

    1. A. NaCl + H₂SO₄ → NaHSO₄ + HCl (below 200°C)
    2. B. NaCl + H₂SO₄ → Na₂SO₄ + HCl (above 200°C)
    3. C. 2NaCl + H₂SO₄ → Na₂SO₄ + 2HCl (room temperature)
    4. D. NaCl + HCl → NaHSO₄ + H₂ (heating required)
    [1]
19. 19.
    How can you distinguish between Sodium sulphite and Sodium thiosulphate using dilute Hydrochloric acid?

    1. A. Both produce sulphur dioxide gas with no visible difference.
    2. B. Sodium sulphite produces sulphur dioxide gas, while sodium thiosulphate produces sulphur dioxide gas and a yellow precipitate of sulphur.
    3. C. Sodium sulphite produces a yellow precipitate, while sodium thiosulphate produces only hydrogen gas.
    4. D. Sodium thiosulphate produces sulphur dioxide gas, while sodium sulphite produces a colorless gas with no odor.
    [1]
20. 20.
    Which two compounds of Lead combine with concentrated hydrochloric acid to liberate chlorine gas?

    1. A. Lead monoxide and Lead sulphate
    2. B. Lead dioxide and Red lead (Pb₂O₄)
    3. C. Lead nitrate and Lead carbonate
    4. D. Lead acetate and Lead chloride
    [1]