Two liquids A and B on mixing produce a warm solution. Which type of deviation from Raoult's law does it show?

On mixing A and B, the solution becomes warm.This means heat released in formation of new bonds between A and B molecules is more than the heat absorbed for the breaking of molecules of A and B.Therefore, the vapour pressure of the solution is reduced and thus the mixture shows negative deviation from Roult's law.

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As the solution got warmed, it means the mixing of solution is exothermic!!

Hence ΔH(mix)

Hence it shows negative deviation.

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