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Question

(i) What is meant by positive deviations from Raoult's Law ? Give an example. 
(ii) What is the sign of $$\Delta _{mix}H$$ for positive derivation?


Solution

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.,  $$\Delta _{mix}H$$  has a positive (+) sign.

Chemistry

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