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In steam distillation of toluene, the pressure for toluene in vapour is

1. (a) Equal to pressure of barometer
2. (b) Less than pressure of barometer
3. (c) Equal to vapour pressure of toluene in simple distillation
4. (d) More than vapour pressure of toluene in simple distillation

Correct answer: (b) Less than pressure of barometer

Solution

In steam distillation, the total pressure is the sum of the partial pressures of water and toluene. The partial pressure of toluene is less than the barometric pressure because water contributes to the total pressure.

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