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

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

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Mass Transfer
Plate towers are preferred to packed towers, when large temperature changes are involved, because of the reason that the

None of these
Viscosity variation of the fluids may cause channeling/flooding
Pressure drop in the equipment will be very high
Packing may be crushed due to thermal expansion/contraction of the components of the equipments

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