Question:medium
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
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
Updated On: Jun 15, 2026
Crystallization
- Sublimation
- Distillation
- Chromatography
Show Solution
The Correct Option is B
Solution and Explanation
To identify the correct purification method for solid substances that undergo direct transition from solid to vapor (sublimation) without an intermediate liquid phase, the following options are assessed:
- Crystallization: Purifies dissolved solids by forming crystals upon cooling. Requires a liquid phase, rendering it unsuitable for direct solid-to-vapor transitions.
- Sublimation: This method is appropriate for solids that transform directly from solid to vapor. It isolates sublimable solids from impurities. This technique precisely matches the described phenomenon.
- Distillation: Involves liquid-to-vapor-to-liquid conversion, thus unsuitable for substances that do not liquefy.
- Chromatography: Separates components by differential adsorption, not directly applicable to simple solid-to-vapor phase changes.
Therefore, Sublimation is the appropriate technique for purifying solids exhibiting direct transition from solid to vapor. This method leverages the characteristic of specific substances to vaporize directly from a solid state and subsequently re-deposit as a purified solid under suitable conditions.
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