Question

In which of the following processes do the change in the states of matter involve the release of energy?
i. Deposition ii. Fusion iii. Solidification iv. Condensation

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

Answer 1

The correct option is B (i), (iii), (iv) only

$\bullet$ Deposition is the reverse of sublimation, i.e. change in the physical state of a substance from a gaseous state to a solid state. Sublimation occurs when heat is absorbed by the matter and deposition occurs when heat is released by the matter.
$\bullet$ Fusion or melting Melting is the transition of a substance from the solid state to a liquid state. Fusion occurs when heat is absorbed by the matter.
$\bullet$ Solidification is the reverse of fusion or melting, i.e. change in the physical state of a substance from a liquid state to a solid state. Fusion or melting occurs when heat is absorbed by the matter and solidification occurs when heat is released by the matter.
$\bullet$ Condensation is the reverse of vaporization i.e. change in the physical state of a substance from a gaseous state to a liquid. Vaporization occurs when heat is absorbed by the matter and condensation occurs when heat is released by the matter.