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
In the gaseous diffusion process of uranium enrichment, the natural uranium is converted into gaseous
A Uranium oxide
B Uranium hexaflouride
C Uranium carbide
D Uranium sulphate
Which of the following curves shows the effect of temperature on the extent of gas-solid adsorption at a given pressure?
A Langmuir adsorption isotherm
B Adsorption isobar
C Freundlich adsorption isotherm
D None of these
Adsorption is an unit operation which generally involves __________ systems.
A Liquid-solid
B Gas-solid
C Fluid-solid
D Solid-solid
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
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
Freundlich equation applies to the adsorption of solute from
A Dilute solutions, over a small concentration range
B Gaseous solutions at high pressure
C Concentrated solutions
D None of these
In Langmuir treatment of adsorption,
A Whole surface of the catalyst does not have the same activity for adsorption and there is attraction between the adsorbed molecule
B Whole surface of the catalyst is essentially uniform and the adsorbed molecule has no effect on the rate of adsorption per site
C All the adsorption does not take place by the same mechanism
D Extent of adsorption is more than one complete monomolecular layer on the surface

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