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Which of the following is the example of crystallisation process?

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Which of the following is the example of crystallisation process?

(a) Purification of alum

(b) Purification of sea water

(c) Separation of gases from air

(d) None of the mentioned

I have been asked this question during an interview.

I would like to ask this question from Crystallisation in chapter Methods of Purification of Engineering Chemistry I

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Correct choice is (a) Purification of alum

Explanation: An impure sample of alum or copper sulphate is purified by crystallisation process. Purification of sea water is example of distillation process.

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