Mass Transfer
Moisture in a solid exerting an equilibrium vapour pressure equal to that of the pure liquid at the same temperature is called the __________ moisture.

Free
Bound
Unbound
Critical

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Mass Transfer
Entrainer used in azeotropic distillation should

Form a low boiling azeotrope with one of the constituents of the mixture
Have high viscosity to provide high tray efficiency
Have high latent heat of vaporisation
Form a new azeotrope of low relative volatility with one of the constituents of the mixture

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