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If a mixture of A and B boils at a temperature lower than the boiling point of either of the components, what kind of deviation does the mixture show?

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If a mixture of A and B boils at a temperature lower than the boiling point of either of the components, what kind of deviation does the mixture show?

(a) No deviation

(b) Maximum and minimum deviation from Raoult’s law

(c) Negative deviation from Raoult’s law

(d) Positive deviation from Raoult’s law

I got this question in exam.

The query is from Vapour Pressure of Liquid Solutions topic in chapter Solutions of Chemistry – Class 12

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Right answer is (d) Positive deviation from Raoult’s law

Explanation: Deviation is always exhibited by non-solutions. Non- ideal solutions do not obey Raoult’s behavior. This is because ΔHmix, ΔVmix ≠ 0. The cause for this is the intermolecular attractions. In this case, molecular attraction between A – B is weaker than that of A – A and B – B. Hence the easier it is to break the bonds and boil faster at a lower temperature than that of either of A and B.

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