Question

In which of the following processes do the change in the states of matter involve the absorption of energy?
i. Boiling ii.Condensation iii. Melting

• A. i only
• B. i and ii only
• C. i, ii and iii
• D. i and iii only

Answer 1

The correct option is D

i and iii only

- Boiling is the vaporization of the liquid when it is heated to its boiling point.

- Condensation is the reverse of evaporation, i.e. change in the physical state of a substance from a gaseous state to a liquid state.

- Melting is the transition of a substance from the solid state to a liquid state.

Boiling and melting occur when heat is absorbed by the matter and condensation occurs when heat is released by the matter.