Q.

A flask contains a mixture of isohexane and 3-methylpentane. One of the liquids boils at 63°C while the other boils at 60°C. What is the best way to separate the two liquids and which one will be distilled out first?

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a

Simple distillation, 3-methylpentane

b

Fractional distillation, isohexane

c

Fractional distillation, 3-methylpentane

d

Simple distillation, isohexane

answer is B.

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Detailed Solution

Mixture of liquids having less difference in boiling points are separated by fractional distillation, in which liquid with lower boiling point comes out first. In this case isohexane (B.Pt. 60°C).
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A flask contains a mixture of isohexane and 3-methylpentane. One of the liquids boils at 63°C while the other boils at 60°C. What is the best way to separate the two liquids and which one will be distilled out first?