Question

Changing of gas directly into a solid by cooling is called ________.

Answer 1

Deposition:

(1) The process by which vapours change into a solid-state, without passing through the liquid state, on cooling, is known as a deposition.

(2) Iodine vapours undergo deposition and form solid crystals of iodine on cooling.

Therefore, changing of gas directly into a solid by cooling is called deposition.