what part of fractional distillation distillation apparatus makes it suitable for separating miscible liquids with boiling point difference of about 25K or less?How?

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Solution

Apparatus used for fractional distillation has a fractionating column. A simple fractionating column has glass beads in it which provide additional surface area because of which the vapours can spread and cool rapidly. Hence, fractionating column is used to provide the additional surface are to facilitate the cooling of vapour in many cycles.

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