A) Sublimation
B) Crystallisation
C) Distillation
D) Extraction with a solvent
Correct Answer: A
Solution :
[a] Sublimation It involves direct conversion of a solid into gaseous state on heating without passing through the intervening liquid state and vice versa on cooling. This process is useful in purification of solids which sublime on heating and are associated with non - volatile impurities, ex. Camphor, naphthalene, benzoic acid, iodine etc.
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