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Question

Which one of the following is the most suitable method to separate a mixture of salt and ammonium chloride ?

A
Evaporation
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B
Boiling
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C
Sublimation
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D
Fusion
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Solution

The correct option is C Sublimation
Sublimation is defined as the process by which a substance in its solid state changes to gaseous state directly, without converting into liquid, due to increase in temperature and/or decrease in pressure.
When a mixture of salt and ammonium chloride are heated together, ammonium chloride sublimes on heating while sodium chloride (NaCl) is left as the residue.

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