Mass Transfer
A pure drug is administered as a sphere and as a cube. The amount of drug is the same in the two tablets. Assuming that the shape and size do not influence the mass transfer, the ratio of rate of dissolution in water at t = 0 for the cubic to spherical tablet is

0.54
1.24
1.04
1.94

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Mass Transfer
The term "cooling range" in a cooling tower refers to the difference in the temperature of

Hot water entering the tower and the wet bulb temperature of the surrounding air
Cold water leaving the tower and the wet bulb temperature of the surrounding air
Hot water entering the tower and the cooled water leaving the tower
None of the listed here

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Mass Transfer
A distillation column with N plates is being operated under normal conditions. At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are being withdrawn and feed to the column is stopped). At the new steady state,

The top and bottom compositions are unchanged with and without total reflux
Reboiler load and condenser load are minimum
Composition of vapors and that of liquid do not vary throughout the column
The top and bottom compositions correspond to the maximum enrichment available

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