Related Questions

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

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