Which of the following solutions shows negative deviations from Raoult's law?

Ethanol-acetone

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carbon disulphide-acetone

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Phenol-aniline

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n-Hexane-n-Heptane

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Solution

The correct option is C Phenol-aniline
In case of Phenol-aniline mixture the intermolecular H-bonding between phenolic proton and lone pair on nitrogen atom of aniline is stronger than the respective intermolecular hydrogen bonding between similar molecules. This decreases the escaping tendency of molecules for each component and consequently the vapour pressure decreases resulting in negative deviation from Raoult's law.

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C H C l_{3} + C H_{3} C O C H_{3}

35^{\circ} C

35^{\circ} C

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