Mass Transfer
Diffusion in concentrated solutins differs from that in dilute solutions, because of the change in the __________ with the concentration of the solution.

Viscosity
Neither A nor B
Degree of ideality
Both A & B

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Mass Transfer
Channelling is most severe

In towers packed randomly with crushed solids
In towers packed with stacked packing
At very high liquid flow rate
In dumped packing of regular units

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