set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

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

Question : 2

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 : 3

Rusting of an iron is an example of

a) oxidation

b) reduction

c) ionization

d) dissociation

Question : 4

Which of the following statements is true about chemical equation ?

a) Mass as well as atoms are conserved

b) Mass is conserved

c) Atoms are conserved

d) Molecules are conserved

Question : 5

The observation that does not indicate a chemical reaction is

a) evolution of a gas

b) change of temperature

c) change of colour

d) None of these

Question : 6

The empirical formula and molecular mass of a compound are CH₂O and 180 g respectively. What will be the molecular formula of the compound ?

a) C₆H₁₂O₆

b) C₉H₁₈O₉

c) CH₂O

d) C₂H₄O₂