Question

The process by which a mixture of sodium chloride and ammonium chloride can be separated, is called :

• A. sublimation
• B. chromatography
• C. evaporation
• D. distillation

Answer 1

The correct option is A sublimation

Sublimation is the transition of a substance directly from the solid to the gas phase without passing through the intermediate liquid phase.
To separate mixtures that contain a sublimate with volatile component from a non-sublimate impurity, the sublimation process is used. Ammonium chloride changes directly from solid to gaseous state on heating. The gaseous form of ammonium chloride can be cooled easily to get a pure solid.