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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.