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