Question

two liquid A and B differ by boiling point of 25k cannot be separeted by distillation ??????​

Answer 1

Fractional Distillation

Separation of a liquid mixture into fractions differing in boiling point (and hence chemical composition) by means of distillation, typically using a fractionating column is called fractional distillation. In other words, separation process in which the volatile components (having different boiling points) and the difference is less than 25 K of a mixture (such as crude oil) are split from one another by heating the mixture in a column and collecting and condensing the vapours drawn from different levels of the column.

Explanation:

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