A. Multiple choice type questions.
1. The reaction given below is:
Zn(s) + CuSO₄(aq) —> ZnSO₄(aq) + Cu(s)
(a) Combination reaction
(b) Displacement reaction
(c) Redox reaction
(d) Displacement and redox reaction.

2. The reaction given below is not a:
C(s) + O₂(g) —> CO₂(g)
(a) Heterogeneous reaction
(b) Displacement reaction
(c) Exothermic reaction
(d) Redox reaction.

3. In the reaction
2KClO₃(s) —> 2KCl(s) + 3O₂(g)
(a) 1 mole of KClO₃ produces 1.5 mole of O₂
(b) 1 mole of KClO₃ produces 3 moles of O₂
(c) 2 moles of KClO₃ produce 1 mole of KCl
(d) when 1 mole of KCl is produced 3 moles of O₂ are produced

4. Which of the following statements about chemical equilibrium is not correct ?
(a) It is dynamic equilibrium.
(b) It can be established by a reversible reaction only.
(c) It is established in any aqueous solution of a strong acid or a strong base.
(d) On changing the temperature the equilibrium constant’s value would also change.

5. pH of a solution is equal to
(a) log [H⁺]
(b) - log [H⁺]
(c) log [OH^–]
(d) - log [OH^–]

6. In which of the following reactions H₂O₂ acts as a reducing agent?
(a) H₂O₂ +2KI —> 2KOH + I₂
(b) H₂O₂ + SO₂ —> H₂SO₄
(c) H₂O₂ + Ag₂O —> 2Ag + H₂O + O₂
(d) 4H₂O₂ + PbS —> PbSO₄ + 4H₂O