Vapours of sulphur escaping from a volcano often form a crust on the r

Vapours of sulphur escaping from a volcano often form a crust on the rocks. The process involved is an example of

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condensation

precipitation

deposition

evaporation

Answer is Right!

Answer is Wrong!

This question was previously asked in

UPSC NDA-2 – 2022

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The correct answer is deposition.

Deposition is the phase transition in which gas transforms into solid without passing through the liquid phase. Sulphur escaping from a volcano as vapour (gas) cools upon contact with rocks and directly forms a solid crust. This is the reverse of sublimation.

Condensation is the change of state from gas to liquid. Precipitation is the process of forming a solid from a solution or vapour phase, often used for meteorological phenomena (rain, snow, etc.) or chemical solid formation from a liquid. Evaporation is the change of state from liquid to gas.

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