Question

What is meant by positive deviation from raoult's law give an example?

Answer 1

Answer:

They have vapour pressures either higher or lower than those predicted by Raoult's law. If the vapour pressure is higher, then the solution is said to exhibit a positive deviation from Raoult's law. A mixture of ethanol and acetone is an example of a solution that shows a positive deviation from Raoult's law.

Answer 2

hlo mate here is ur ans...

ANSWER

Positive deviation from Rauolt's law means that the observed vapour pressure is greater than expected and It occur when A-B attractions are weaker than the average of the attraction in the pure component of the mixture. For example, a mixture of ethnol and ecetone show a positive deviation from Rault's law.

In case of solutions showing positive deviations, absorption of heat takes place, i.e., Δ mix H has a positive (+) sign.

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