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The mixture that forms maximum boiling azeotrope is:

1. Water + Nitric acid
2. Ethanol + Water
3. Acetone + Carbon disulphide
4. Heptane + Octane

Correct answer: Water + Nitric acid

Solution

Water and nitric acid form a maximum boiling azeotrope due to strong hydrogen bonding, which makes their boiling point higher than either component's boiling point.

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