Question

what is meant by positive deviation from Raoults law ? Give an example.

Answer 1

In these type of deviations,the partial vapour pressure of each component A and B of solution is higher than the vapour pressure calculated 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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