Fractional distillation is a separation process for :

Liquid-liquid

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Liquid-solid

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Solid-solid

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Both b and c

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Solution

The correct option is A Liquid-liquid
Fractional distillation is a separation process for liquid-liquid mixture into its component parts, or fractions.
The separation depends on the difference in the boiling point (usually 25 $^{o}$ C at 1 atm) of individual components. The mixture is heated to a temperature at which one or more fractions of the compound will vaporize.
For boiling point difference greater than 25 $^{o}$ C, a simple distillation is used.

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