__________ is concerned with the adsorption equilibria.

When adsorption hysteresis is observed, the desorption equilibrium pressure is __________ that obtained by adsorption.

A

Always lower than

B

Always higher than

C

Same as

D

Dependent on the system; can be either lower or higher than

In case of physical adsorption, the heat of adsorption is of the order of __________ kcal/kg.mole.

A

100

B

1000

C

10000

D

100000

In case of physical adsorption, the difference between heat of adsorption and heat of normal condensation is

A

Equal to the heat of formation of surface compound

B

Equal to the heat of wetting

C

Zero

D

Called integral heat of adsorption

The equilibria relations in a multicom-ponent and multiphase system can not be calculated with the help of the

A

Phase rule

B

Experimental data

C

Emperical equations

D

Theoretical equations

The number of degrees of freedom for an azeotropic mixture in a two component vapour-liquid equilibria is/are

A

Zero

B

One

C

Two

D

Three

In case of vapor-liquid equilibria, which of the following does not account for gas phase deviation from ideality?

A

Use of equation of state

B

Fugacity co-efficient

C

Activity co-efficient

D

None of these

Removal of __________ exemplifies an adsorption unit operation.

A

Uranium from its ore

B

Water from petrol

C

Ammonia from coke oven gas

D

Mustard oil from mustard seed

For a solid catalysed chemical reaction, the effectiveness of solid catalyst depends upon the __________ adsorption.

A

Physical

B

Chemical

C

Both A and B

D

Neither A nor B

Adsorption is an unit operation which generally involves __________ systems.

A

Liquid-solid

B

Gas-solid

C

Fluid-solid

D

Solid-solid

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

A

Increases

B

Decreases

C

Remains unchanged

D

May increase or decrease ; depends on the type of adsorbate

__________ is concerned with the adsorption equilibria.

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