A student purchases common salt from the market which is contaminated with ammonium chloride. Identify the technique that he should adopt to obtain pure NaCl.

Filtration

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Crystallisation

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Sublimation

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Sedimentation

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Solution

The correct option is C Sublimation
Ammonium chloride is a substance which directly converts to vapour upon heating, without going through the liquid state. This process is called sublimation. The vapours can be collected and condensed into a separate flask. On the other hand, NaCl does not get vaporised at that temperature and can be separated easily.

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