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Q.

Which of the following pair can be separated by fractional distillation?

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a

Water-Nitric acid

b

Water-Hydrochloric acid

c

Benzene-Toluene

d

Ethanol-water

answer is B.

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Detailed Solution

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  • Benzene-toluene mixture can be separated into pure components by fractional distillation.
  • The other components are soluble in water and acids become diluted when water is added to them.
  •  So, since the solutions formed will have almost homogenous properties, it is not possible to separate the other mixtures as their difference in boiling points is not varying by a lot.
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