Question

In which of the following processes does a change in state involve absorption of heat?
A. Freezing
B. Sublimation
C. Condensation
D. Melting

• A. B and C
• B. B and D
• C. A, B and C
• D. A and B

Answer 1

The correct option is B

B and D

Sublimation:- The phase transition of a solid to its gaseous state without going through the intermediate liquid state. It involves absorption of heat to convert from the solid to the gaseous state.

Melting:- The phase transition of a solid to the liquid state on the absorption of heat is called melting.

In condensation (conversion of gas to liquid state) and freezing (conversion of liquid to solid state) heat is removed. Kinetic energy of molecules reduces and phase transition takes place.

$Solid\stackrel{heat}{\to }Liquid\stackrel{heat}{\to }Gas$