NEET 2001 Chemistry question

In steam distillation of toluene, the pressure of toluene in vapour is : -

(1)Equal pressure of barometer
(2)Less than pressure of barometerCorrect
(3)Equal to vapour pressure to toluene in simple distillation
(4)More than vapour pressure of toluene in simple distillation

Answer: (2)

Solution

In steam distillation the mixture (toluene + water, immiscible) boils when the sum of the vapour pressures of the two liquids equals the atmospheric (barometric) pressure: . Hence the partial pressure of toluene in the vapour is necessarily less than the

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Question ID VK-088800