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Considering the formation, breaking and ...

Considering the formation, breaking and strength of hydrogen bond, predict which of the following mixtures will show positive deviation from Raoult's law?

A

Methanol and acetone

B

Chloroform and acetone

C

Nitric acid and water

D

Phenol and aniline

Text Solution

Verified by Experts

The correct Answer is:
A
In pure methanol, molecules are hydrogen bonded. One adding acetone, its molecules get in between the host molecules and break some of the hydrogen bonds between them.
Therefore, the intermolecular attractive forces between the solute-solvent molecules are weaker than those between the solute-solute and solvent-solvent molecules.
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