Mass Transfer
In case of constant underflow extraction operation, the __________ at all solute concentration.

Solids are drained to the same extent
Ratio of the insoluble to solution is constant
Both A & B
Neither A nor B

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Mass Transfer
For the air water system under ambient conditions, the adiabatic saturation temperature and the wet bulb temperature are nearly equal, because

Lewis number is close to unity
Solubility of the components of air in water is very small
Water has a high latent heat of evaporation
They are always equal under all circumstances

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