set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

$Na_2S_2O_3$ represent the compound

a) sodium thiosulphate

b) sodium sulphate

c) sodium sulphite

d) None of these

Question : 2

The chromate and dicharomate ions are respectively

a) CrO^-₄ and CrO^-₅

b) CrO^2-₄ and Cr₂O^2-₇

c) Cr₂O^2-₇and CrO_4-

d) CrO^2-₄ and Cr₂O^2-₅

Question : 3

A redox reaction is one in which -

a) an acid is neutralised by the base

b) both the substance are reduced

c) both the substance are oxidised

d) one substance is oxidised while the other is reduced

Question : 4

An organic compound containing C, H and O gave on analysis C – 40% and H – 6.66%. Its empirical formula would be

a) CH₂O

b) C₃H₆O

c) CHO

d) CH₄O

Question : 5

Valency of an atom or radicals is

a) its combining capacity

b) ionisation energy

c) electron affinity of atom

d) size of atom

Question : 6

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