Multiple choice

The process of conversion of solid directly into the gas is known as

  1. distillation

  2. sublimation

  3. crystallisation

  4. evaporation
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Sublimation is a direct change from the solid state to gaseous state, without passing through the liquid state. If a mixture contains two solids, one sublimable, and the other non-sublimable, they can be separated by the process of sublimation. The solid that sublimes, escapes in the form of vapours. When these vapours are collected on a cold surface, they condense to form the sublimable solid, known as the sublimate.

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