How would you obtain pure ammonium chloride when it contains potassium chloride as an impurity?

Chromatography

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Crystallisation

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Sublimation

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None of the above

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Solution

The correct option is C Sublimation
A mixture of ammonium chloride and potassium chloride can be separated using the process of sublimation. In this case, the sublimable temperatures of ammonium and potassium chloride differ widely. Between the two, ammonium chloride has a lower sublimable temperature. Therefore, it sublimes first followed by potassium chloride.

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During sublimation of ammonium chloride, pure ammonium chloride gets:

(C a C l_{2})

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