An azeotropic solution of two liquids has boiling point lower than either of them when it:

Shows negative deviation from Raoult’s law

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Shows no deviation from Raoult’s law

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Shows positive deviation from Raoult’s law

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Is saturated

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Solution

The correct option is C Shows positive deviation from Raoult’s law
In case of positive deviation from Raoult's law, the observed vapour pressure is greater than the ideal vapour pressure and boiling point of azeotrope becomes lower than either of pure liquid.

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