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
Molecular diffusion is caused by the

Activation energy of the molecules
Potential energy of the molecules
Transfer of molecules from low concentration to high concentration region
Thermal energy of the molecules

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Mass Transfer
In case of a desorber (stripper), the

Temperature always increases
Operating line always lies below the equilibrium curve
Temperature remains unaffected
Operating line always lies above the equilibrium curve

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