On heating, some solid substances change from solid to vapour state without passing through liquid s

Question

On heating, some solid substances change from solid to vapour state without passing through liquid state. The technique used for the purification of such solid substances based on the above principle is known as

Accepted Answer

Sol. [Key Concept: Sublimation as a purification method]Sublimation is direct conversion of a solid into vapour without passing through the liquid state under the conditions used. A sublimable solid can be separated from nonvolatile impurities by heating and then collecting the deposited solid on a cooler surface. Hence, option (4).

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