Discussion
Which of the following cannot be separated by Crystallization ?
Answer: B
The mixture that cannot be separated by crystallization is a solution of methyl alcohol and potassium permanganate.
Crystallization recovers a pure solid from its solution by evaporating the solvent until crystals form. Potassium permanganate is a strong oxidising agent and reacts with methyl alcohol, so the two do not stay a simple solution from which the permanganate can be crystallized back unchanged. Methyl alcohol, a volatile liquid, is in any case recovered by distillation, not crystallization.
The others are standard uses of crystallization: salt is obtained from impure salt or sea water, alum is purified from an impure sample, and zinc chloride and lead(II) chloride can be separated because lead(II) chloride is far less soluble in cold water and crystallizes out first.
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