Which of the following binary mixtures will have same composition in liquid and vapour phase?

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n-hexane - n - heptane

Water-nitric acid

Benzene-toluene

methanol-ethanol

answer is B.

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Detailed Solution

Mixtures having same composition in liquid and vapour phase are known as azeotropes. Azeotropes boils at same temperature. Here, water-nitric acid and water-ethanol mixtures are non-ideal solution. Hence, water-nitric acid and water - ethanol are examples of azeotropes. While mixtures of benzene-toluene and n - hexane - n - heptane are the examples of ideal solutions.

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