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

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

1.04

1.24

0.54

1.94

1.04

1.24

0.54

1.94

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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.

Either same or higher than

Lower than

Higher than

Same as

Either same or higher than

Lower than

Higher than

Same as

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Mass Transfer
If f is defined as above, then which of the following applies to a feed at dew point?

F = 1

F > 1

0 < f < 1

F < 1

F = 1

F > 1

0 < f < 1

F < 1

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Mass Transfer
With increase in the concentration of the adsorbate, the integral heat of adsorption

May increase or decrease ; depends on the type of adsorbate

Remains unchanged

Increases

Decreases

May increase or decrease ; depends on the type of adsorbate

Remains unchanged

Increases

Decreases

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Mass Transfer
As per Gilliland's equation, the diffusivity is

Inversely proportional to 'P'

All of these

Dependent on the molecular volume & molecular weight of components

Directly proportional to 'T1.5'

Inversely proportional to 'P'

All of these

Dependent on the molecular volume & molecular weight of components

Directly proportional to 'T1.5'

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Mass Transfer
In case of an unsaturated mixture of gas and vapor, the percentage saturation is __________ its relative saturation.

Lower than

Either A or B, depends on the mixture composition

Equal to

Higher than

Lower than

Either A or B, depends on the mixture composition

Equal to

Higher than

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Mass Transfer

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

Mass Transfer If f is defined as above, then which of the following applies to a feed at dew point?

Mass Transfer With increase in the concentration of the adsorbate, the integral heat of adsorption

Mass Transfer As per Gilliland's equation, the diffusivity is

Mass Transfer In case of an unsaturated mixture of gas and vapor, the percentage saturation is __________ its relative saturation.

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

Mass Transfer
If f is defined as above, then which of the following applies to a feed at dew point?

Mass Transfer
With increase in the concentration of the adsorbate, the integral heat of adsorption

Mass Transfer
As per Gilliland's equation, the diffusivity is

Mass Transfer
In case of an unsaturated mixture of gas and vapor, the percentage saturation is __________ its relative saturation.