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Mass Transfer

Mass Transfer
Pore size of the molecular seive 5A is __________ mm.

0.5
0.05
50
5

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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

0.54
1.94
1.24
1.04

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Mass Transfer
Mass transfer co-efficient is directly proportional to DAB0.5, according to __________ theory.

Penetration
Surface renewal
None of these
Film

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Mass Transfer
Which of the following has the same dimension as mass diffusivity?

Thermal diffusivity
Kinematic viscosity
Momentum flux
Both Momentum flux & Kinematic viscosity

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Mass Transfer
Though, theoretically the adsorption & desorption isotherms is expected to coincide but sometimes at least a part of the isotherms does not coincide and this phenomenon is known as adsorption hysterisis. In such cases, the desorption equilibrium pressure is __________ that obtained for adsorption.

Same as
Either same or higher than
Lower than
Higher than

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Mass Transfer
Unit of molal diffusivity is

Cm²/sec gm . mole
Gm moles/cm² . sec
Gm moles/cm². sec
Gm moles/cm. sec

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