classification of elements, chemical bonding, periodicity in properties & physical transformation - Category wise Question and Answer Practice Test with Solutions

Question : 26

Consider the following statements :

1. The rate of evaporation depends only on the surface area exposed to the atmosphere.
2. Latent heat of vaporisation is the heat energy required to change 1 kg of a liquid to gas at atmospheric pressure at its melting point.

a) 1 and 2 both

b) 1 only

c) 2 only

d) None

Question : 27

Which is not true about noble gases?

a) They exist in atomic form

b) They are radioactive in nature

c) They are non-metallic in nature

d) Xenon is the most reactive among them

Question : 28

Consider the following statements :

1. The molecules in a gas are in constant motion.
2. Gases have the same pressure throughout the entire atmosphere.
3. Gas molecules are always evenly distributed in the atmosphere.

a) 1 only

b) 1 and 2

c) 2 and 3

d) 2 only

Question : 29

Which one of the following is most electropositive element?

a) Calcium

b) Aluminium

c) Sodium

d) Silicon

Question : 30

Which of the following elements A, B, C, D and E with atomic number 3, 11, 15, 18 and 19 respectively belong to the same group?

a) B, C, D

b) A, D, E

c) A, B, C

d) A, B, E