set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

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 : 2

The reactions in which two compounds exchange their radicals to form two new compounds are called

a) double displacement reaction

b) displacement reaction

c) decomposition reaction

d) isomerisation reaction

Question : 3

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 : 4

Rusting of an iron is an example of

a) oxidation

b) reduction

c) ionization

d) dissociation

Question : 5

The empirical formula of a compound is CH₂ . One mole of this compound has a mass of 42 grams. Its molecular formula is :

a) CH₂

b) C₃H₆

c) C₃H₈

d) C₂H₂

Question : 6

The branch of chemistry which deals with study of physical properties and conditions is

a) nuclear chemistry

b) physical chemistry

c) analytical chemistry

d) pharmaceutical chemistry