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Solution


Q.

A solution of two miscible liquids showing negative deviation from Raoult’s law will have:            [2024]
1 increased vapour pressure, decreased boiling point  
2 increased vapour pressure, increased boiling point  
3 decreased vapour pressure, decreased boiling point  
4 decreased vapour pressure, increased boiling point  

Ans.

(4)

The actual pressure of solution is less than that predicted by Raoult's law. This happens if A-B attractions are stronger than A-A and B-B interaction, as in that case molecules will have lesser tendency to vapourise. This kind of solution is said to follow negative deviation from Raoult's law. Boiling occurs when vapour pressure of a liquid is equal to atmospheric pressure. As vapour pressure of the solution is less than expected value, it needs to be heated to a higher temperature in order to match its vapour pressure with atmospheric pressure. Hence boiling point of the solution is more than the expected value.