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In the nonideal solution, why can't one of the solute be positive deviation and the other be negative deviation?
Let's say A and B makes a nonideal solution.
The moleculat force between A and B means A-B.
Let's say A-A > A-B > B-B.
Then A would evaporate more than in the pure state, and B would evaporate less than in the pure state.
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  • $\begingroup$ Have you read that it's not possible..? Please refer to any text.. it will be helpful. $\endgroup$ – ABC Aug 29 '17 at 5:50
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For multiple component systems we use activity coefficient $\gamma$ in modified Roult's law as: $$K_i=\gamma \frac{P_i^\star}P $$

and $\gamma$ is defined in the terms of $f$ : fugacity or fictitious pressure for a real gas.

You should read further about "Vapour Liquid Equilibrium" for multiple components.

Maybe: http://www.journalrepository.org/media/journals/BJAST_5/2012/Dec/1355741742-Olaleke312012BJAST1789.pdf. You can see there is no reason why it can't have deviation in multiple directions.

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  • $\begingroup$ Please include the essential part of the reference in your answer. Unless the question is a reference-request, we strongly discourage replies that refer the OP to an external resource, short or long. Helpful links on their own are comments, and links should be archived if possible. $\endgroup$ – Linear Christmas Dec 27 '17 at 14:17

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