Question

When acetone and chloroform are mixed, hydrogen bonding takes place between them. Such a liquid pair will show

• A. Positive deviation from Raoult’s law
• B. Negative deviation from Raoult’s law
• C. No deviation from Raoult’s law
• D. Cannot be predicted

Answer 1

The correct option is B Negative deviation from Raoult’s law

When chloroform is mixed with acetone, the molecules of chloroform form hydrogen bonding with the molecules of acetone, this increases the interactive molecular forces between solute – solvent (A – B) than that of A – A and B – B, leading to a decrease in vapour pressure of the solution than expected. Thus the mixture of chloroform and acetone shows negative deviation from Raoult’s Law.