Liquid should have the difference 30 degree in their boiling point to take care for fractional distillation
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Solution
Fractional distillation is a technique in which you can separate two or more substances with small difference in boiling point. The fractional distillation is best effective only when there is a significant difference between the boiling point of two liquids . That is why the liquids have a difference of 30 degree in their boiling point