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Q.

Impure naphthalene is purified by

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a

Fractional cystallization

b

Fractional distillation

c

Solvent extraction

d

Sublimation

answer is D.

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Detailed Solution

This process is very useful for separation of substances which are sublimable on heating from non volatile impurities.Eg: Benzoic acid, Naphthalene, Anthracene, Camphor, Anthraquinone, Indigo etc.Condition: The compound should have high vapour pressure below its melting point.
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