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Question

The mixture that forms minimum boiling azeotrope is:

A
Water + nitric acid
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B
Ethanol + water
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C
Benzene + toluene
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D
n- hexane + n-heptane
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Solution

The correct option is B Ethanol + water
The solutions which show a large positive deviation from Raoult’s law form minimum boiling azeotrope at a specific composition.
(a) Water + nitric acid show large negative deviation from Raoult’s law form maximum boiling azeotrope at a specific composition
(b) Ethanol-water mixture show a large positive deviation from Raoult’s law form minimum boiling azeotrope at a specific composition.
(c) Benzene + toluene form ideal solution.
(d) n- hexane + n-heptane is an example of ideal solution.

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