Which of the following mixtures forms a minimum-boiling azeotrope?

Ahydrochloric acid and water
Bchloroform and acetone
Cethanol and water
Dnitric acid and water

Answer: C

Minimum-boiling azeotropes arise from large positive deviation from Raoult's law, because the mixture has a higher vapour pressure than either ideal expectation and boils at lower temperature. Ethanol-water is of this type. Nitric acid-water, chloroform-acetone and HCl-water show negative deviation and form maximum-boiling azeotropes.

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