To separate common salt and ammonium chloride we use the property that ammonium chloride ___________ while salt does not.

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Solution

The process in which a solid directly changes into a gas without passing into liquid is called sublimation. Example: Naphthalene, camphor.
When a mixture of salt (sodium chloride) and ammonium chloride is heated, ammonium chloride changes into gas leaving behind the sodium chloride.
Therefore, to separate common salt and ammonium chloride we use the property that ammonium chloride sublimes while salt does not.

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