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Which of the mentioned is a unit operation?

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Which of the mentioned is a unit operation?

(a) Polymerization

(b) Steam reforming

(c) Catalytic cracking

(d) Distillation
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Correct choice is (d) Distillation

For explanation: Distillation is a process of separation of miscible liquids on basis of their difference in vapor pressures, which involves no chemical reactions whereas the rest involve chemical changes.
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