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Q.

Which of the following solution pairs can be separated by fractional distillation?

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a

Benzene + toluene

b

H2O + HNO3

c

H2O + HCl

d

C2H5OH + H2O

answer is B.

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Detailed Solution

H2O+HNO3 ---  Maximum boiling azeotrope

H2O+HCl    ---   Maximum boiling azeotrope

H2O+C2H5OH ---  Minimum boiling azeotrope

It is not possible to separate azeotropic mixture by fractional distillation.

At certain composition both the components boil at the same temperature

They form constant boiling mixtures

Benzene + toluene is an ideal sol.

The mixture can be separated by fractional distillation as they do not form

Constant boiling mixture

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