Question

A solid material is supplied with heat at a constant rate. The temperature of material is changing with heat input as shown in the figure. What does slope $DE$ represent :

• A. latent heat of liquid
• B. latent heat of vapour
• C. heat capacity of vapour
• D. inverse of heat capacity of vapour

Answer 1

Answer: (C)

heat capacity of vapour

The part $OA$ is the increase of temperature in solid state.

The part $AB$ is change of state from solid to liquid at constant temperature.

The part $BC$ is the increase of temperature in liquid state.

The part $CD$ is change of state from liquid to gas at constant temperature.

The part $DE$ is the increase of temperature in gaseous phase, i.e., slope is heat capacity of vapour.