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Impure naphthalene is purified by

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Fractional cystallization

Fractional distillation

Solvent extraction

Sublimation

answer is D.

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Detailed Solution

Sublimation is used for separation of certain organic substances which sublime (passes directly from solid to vapor state non-volatile impurities. Examples are camphor, benzoic acid, naphthalene and anthracene, etc.

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