Page 272 - Chemistry ICSE Class X

258 ICSE Chemistry – 10

Questions from Board Papers

Q 1. Write the equation for each of the following reactions: [ICSE 2010]
(i) Sulphur is heated with concentrated sulphuric acid.
(ii) Concentrated sulphuric acid is poured over sugar.
Q 2. Give equation for the preparation of each of the following salts from the starting material given. [ICSE 2010]
(i) Copper sulphate from Copper(II) oxide.
(ii) Potassium sulphate from Potassium hydroxide solution.
Q 3. What would you observe when sugar crystals are added to a hard glass test tube containing concentrated
sulphuric acid. [ICSE 2011]
Q 4. Choose the correct answer from the options given below: [ICSE 2011]
When dilute sulphuric acid reacts with iron sulphide, the gas evolved is ______________ .
(A) Hydrogen sulphide (B) Sulphur dioxide
(C) Sulphur trioxide (D) Vapour of sulphuric acid.
Q 5. (i) With the help of equations, give an outline for the manufacture of sulphuric acid by the contact process.
[ICSE 2011]
(ii) What property of sulphuric acid is shown by the reaction of concentrated sulphuric acid when heated with
(A) Potassium nitrate (B) Carbon?
Q 6. Name the gas produced on reaction of dilute sulphuric acid with a metallic sulphide. [ICSE 2012]
Q 7. Some properties of sulphuric acid are listed below. Choose the role played by sulphuric acid as A, B, C or D
which is responsible for the reactions (i) to (v). Some role(s) may be repeated. [ICSE 2012]
A. Dilute acid B. Dehydrating agent C. Non-volatile acid D. Oxidising agent
2 SO
conc. H
(i) CuSO .5H O ⎯⎯⎯⎯⎯→ CuSO + 5H O
4
4
4
2
2
(ii) S + H SO (conc.) o 3SO + 2H O
2
2
2
4
< 200°C
(iii) NaNO + H SO (conc.) o NaHSO + HCl
3
4
2
4
(iv) MgO + H SO o MgSO + H O
2
4
4
2
(v) Zn + 2H SO (conc.) o ZnSO + SO + 2H O
2
4
2
2
4
Q 8. Give balanced equation for the following reaction: [ICSE 2012]
(i) Zinc sulphide and Dilute sulphuric acid.
Q 9. Identify the anion present in the following compound: [ICSE 2012]
(i) Compound X on heating with copper turnings and concentrated sulphuric acid liberates a reddish brown
gas.
Q 10. Identify the anion present in the following compounds: [ICSE 2012]
(i) Compound X on heating with copper turnings and concentrated sulphuric acid liberates a reddish brown
gas.
(ii) Compound Z which on reacting with dilute sulphuric acid liberates a gas which turns lime water milky, but
VJG ICU JCU PQ GHHGEV QP CEKFKſGF RQVCUUKWO FKEJTQOCVG UQNWVKQP
(iii) Compound L on reacting with Barium chloride solution gives a white precipitate insoluble in dilute
hydrochloric acid or dilute nitric acid.
Q 11. State one appropriate observation for the following: [ICSE 2013]
(i) Concentrated sulphuric acid is added drop wise to a crystal of hydrated copper sulphate.
Q 12. Choose the most appropriate answer from the following options: [ICSE 2013]
(i) In the given equation, identify the role played by concentrated sulphuric acid
S + 2H SO o 3SO + 2H O
4
2
2
2
(A) Non-volatile acid (B) Oxidising agent (C) Dehydrating agent (D) None of these