Which of the following is method is used to separate 'alum' from impurities?

evaporation

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crystallization

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distillation

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none of these

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Solution

The correct option is B crystallization
Crystallization is used to separate alum from impurities. Alum is used in loading process to attract all the impurities to its surface. In crystallization, the alum is heated. During heating, the pure alum gets separated from its solution of impurities in form of a crystal.

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