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a
Sublimation
b
Evaporation
c
Filtration
d
Decantation
answer is A.
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Detailed Solution
This process is very usefull for seperation of subttances which are sublimable on heating from non volatile impurities.Eg: Benzoic acid, Naphthalene, Anthracene, Camphor, Anthraquinone, Indigo etc.Condition: The compound sholud have high vapour pressure below its melting point