Question

Which of the following is correct for processes involved in state change?

• A. Boiling is same as condensation
• B. Evaporation is the opposite of condensation
• C. Freezing is the opposite of melting
• D. Freezing is same as melting

Answer 1

Answer: (B), (C)

Freezing is the opposite of melting

$\bullet$ The process in which a substance converts from liquid state to its gaseous state on absorption of heat, below its boiling point, is called evaporation.
$\bullet$ The process in which a substance converts from gaseous state to liquid state on cooling is called condensation.
$\bullet$ Hence, evaporation can be considered as opposite of condensation.

$\bullet$ The process in which a substance converts from solid state to its liquid state on heating is called melting.
$\bullet$ The process in which a substance converts from liquid state to its solid state on cooling is called freezing.
$\bullet$ Hence, freezing is the opposite of melting.