Choose the correct statement of the following
(a) Conversion of solid into vapours without passing through the liquid state is called sublimation.
(b) Conversion of vapours into solid without passing through the liquid state is called vaporisation.
(c) Conversion of vapours into solid without passing through the liquid state is called freezing.
(d) Conversion of solid into liquid is called sublimation.

Correct Answer: (a) Conversion of solid into vapours without passing through the liquid state is called sublimation. 

Explanation: Sublimation is a process in which a solid is converted into vapours without passing through a liquid state.

Vaporisation is a phase transition from liquid to vapours.

The conversion of liquid to solid at substance’s freezing temperature is called freezing.