The change of gaseous state directly to solid state without going through liquid state is called _____.
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → Deposition
When a gas turns directly into a solid, without first becoming a liquid, the change is called deposition. Frost forming on a cold window from water vapour in the air is a common example.
Why the other options are incorrect
Option (1) Solidification — Incorrect. It is the change from liquid to solid (freezing).
Option (2) Sublimation — Incorrect. It is the reverse change, solid directly to gas, as with camphor or dry ice.
Option (4) Evaporation — Incorrect. It is the change from liquid to gas at the surface of the liquid.
Tip: Sublimation and deposition are a pair: solid to gas is sublimation, and gas to solid is deposition.