benzene and toluene solution and benzene and CCl4 solution both are ideal in nature then how to explain the positive deviation of toluene and CCl4 solution?

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Solution

A-B attractive force should be weaker than A-A and B-B attractive forces. 'A' and 'B' escape easily showing higher vapour pressure than the expected value. That is the attractive force between Toluene and CCl₄ is weaker than Toluene-Toluene or CCl₄-CCl₄ solution. That is why the observed vapour pressure of the mixture is more than the expected one and it shows positive deviation.

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