Which of the following liquid pairs will exhibit a positive deviation from Raoult's law?

Water - Hydrochloric acid

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Cyclohexane - Ethanol

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Acetone - Chloroform

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Water - Nitric acid

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Solution

The correct option is B Cyclohexane - Ethanol
A mixture of cyclohexane and ethanol shows positive deviation from Raoult's law. The intermolecular forces present are weaker than those present in the ideal solution.

The total vapour pressure of the solution is greater than the total vapour pressure of the ideal solution. Also, the vapour pressure of each component is greater than that predicted from Raoult's law.

Option B is correct.

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