set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

Which one is a combination reaction ?

a) Ca(OH)₂ + Na₂CO₃ ⟶ 2NaOH + CaCO₃ ↓

b) Formation of a mixture of carbon monoxide and hydrogen. When steam is passed over red hot iron.

c) Reaction of water with sodium metal to form sodium hydroxide and hydrogen.

d) Preparation of stannic chloride (Tin (iv) chloride) by passing chlorine gas into molten tin (Sn).

Question : 2

Which of the following reaction is endothermic?

a) CH₄ + 2O₂ ⟶ CO₂ + 2H₂O

b) C + O₂ ⟶ CO₂

c) CaCO₃ ⟶ CaO + CO₂

d) CaO + H₂ O ⟶ Ca(OH)₂

Question : 3

Valency of an atom or radicals is

a) its combining capacity

b) ionisation energy

c) electron affinity of atom

d) size of atom

Question : 4

The branch of chemistry which deals with study of the methods of detection and determination of elements and compounds is

a) Analytical chemistry

b) Physical chemistry

c) Nuclear chemistry

d) Bio chemistry

Question : 5

In the reaction : PbO + C ⟶ Pb + CO

a) C is reductant

b) PbO is oxidised

c) PbO is oxidant

d) Both (a) and (c)

Question : 6

Which one is a bivalent ion?

a) sulphide

b) sodium

c) calcium

d) Both (b) and (c)