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Question

Which one of the following methods is not used to purify liquid organic compound?
  1. Fraction distillation
  2. Simple distillation
  3. Steam distillation
  4. Fractional cyrstallisation

A
Simple distillation
B
Steam distillation
C
Fraction distillation
D
Fractional cyrstallisation
Solution
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In chemistry, fractional crystallization is a method of refining substances based on differences in their solubility. This technique is often used in chemical engineering to obtain very pure substances, or to recover saleable products from waste solutions.

Therefore Fractional cyrstallisation is not used to purify liquid organic compound .

Hence , option D is correct .

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