Question -
Which one of the following mixtures can be separated into pure components by fractional distillation
Options:
A .  Benzene – toluene
B .  Water – ethyl alcohol
C .  Water – nitric acid
D .  Water – hydrochloric acid
Answer: Option A : A Only Benzene-Toluene mixture forms an ideal solution. Rest shows either positive or negative deviation from Raoult's law hence will form Azeotrope which can't be separated by fractional distillation.
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