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Mass Transfer

Mass Transfer
Rate of leaching increases with increasing

Pressure
Size of the solid
Viscosity of solvent
Temperature

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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

1.24
1.94
1.04
0.54

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Mass Transfer
Acetic acid will be most economically separated from a dilute solution of acetic acid in water by

Absorption
Solvent extraction
Continuous distillation
Evaporation

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Mass Transfer
Diameter of raschig rings used in packed tower in industry is normally around __________ inches.

8
18
12
2

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Mass Transfer
For turbulent mass transfer in pipes, the Sherwood number depends on the Reynolds number as

Re0.53
Re0.33
Re0.83
Re

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Mass Transfer
Which of the following equipments is not used for gas dispersion?

Agitated vessels
Bubble cap tray towers
Spray towers
Perforated sieve tray towers

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