Question

The temperature of a substance remains unaffected during its change of state.

• A. True
• B. False

Answer 1

The correct option is A True

1. Change of state is an isothermal process in which temperature is constant throughout the phase change.
2. For example boiling point of water is 100⁰C and when water reaches its boiling point it starts boiling, the excess heat supplied is utilised in phase change.
3. The temperature remains constant until all the liquid is converted into vapour and the heat supplied for phase change is called the latent heat of vapourisation.

Hence, the given statement is true.