1.

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

Answer»

Methanol and acetone
Chaloroform and acetone.
Nitric acid and water
PHENOL and aniline.

Solution :Explanation : (A - A)* interaction is greater than the (A - B)** interaction. Intermolecular hydrogen bonding in methanol is more than methanol and acetone separately. So, methanol and acetone mixture will show a positive DEVIATION from Raoult.s LAW.
(A - A)* Interaction represents interaction between particles / molecules of acetone AMONG which there is no hydrogen bonding.
(A - B)** Interaction is the interaction between the particles / molecules of acetone and methanol.


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