Which of the following substances when mixed with sand cannot be separated by sublimation?

Sodium chloride

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Ammonium chloride

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Iodine

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Naphthalene

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Solution

The correct option is D Sodium chloride
Sublimation method is used for separating substances which on heating change directly into vapour phase.
Substances like iodine, ammonium chloride, naphthalene sublime on heating. But sodium chloride is non-volatile in nature and thus it does not sublime on heating.

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