Which method is used to separate a mixture of salt and ammonium chloride?

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Sublimation

Dialysis

Chromatography

Distillation

answer is A.

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Detailed Solution

When a solid substance directly changes its state from solid to gaseous on heating without going through the liquid phase, then this process is known as sublimation. The substance that can undergo sublimation is called sublimate.
Examples are naphthalene, camphor, ammonium chloride (NH₄Cl), benzoic acid, and iodine.
Since in the mixture of salt (sodium chloride) and ammonium chloride, ammonium chloride is a sublimate, they can be separated by the method of sublimation.
Ammonium chloride sublimes after some heating leaving behind the salt (sodium chloride).

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