set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

Which of the following involves combination of two elements?

a) 2SO₂ + O₂ ⟶ 2SO₃

b) CaO + CO₂ ⟶ CaCO₃

c) 4Na + O₂ ⟶ 2Na₂O

d) NH₃ + HCl ⟶ NH₄Cl

Question : 2

Which of the following is most unreactive ?

a) Mg²⁺

b) Mg

c) Mg⁺

d) All above species are inert

Question : 3

Select the one that represents a displacement reaction.

a) HCl + NaOH ⟶ NaCl + H₂O

b) NaCl + AgNO₃ ⟶ AgCl + NaNO₃

c) Zn + CuSO₄ ⟶ ZnSO₄ + Cu

d) C + O₂ ⟶ CO₂

Question : 4

A molal solution is one that contains 1 mole of a solute in

a) one litre of the solution

b) one litre of the solvent

c) 1000 g of the solvent

d) 22.4 litres of the solution

Question : 5

Which one of the following is not an exothermic reaction ?

a) Burning of a candle

b) Respiration

c) Slaking of lime

d) Dipping of iron block in water

Question : 6

Rusting of an iron is an example of

a) oxidation

b) reduction

c) ionization

d) dissociation