Q.

The mixture that forms maximum boiling azeotrope is

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a

heptane + octane

b

water + nitric acid

c

ethanol + water

d

acetone+carbon disulphide.

answer is B.

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Detailed Solution

Maximum boiling azeotropes are formed by those solutions which show negative deviations from Raoult's law. H2O and HNO3 mixture shows negative deviations.Mineral acids when dissolved in water get ionised. Strong ion - dipole attractions develop between mineral acid and water molecules.
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The mixture that forms maximum boiling azeotrope is