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 hysteresis. In such cases, the desorption equilibrium pressure is ______________ that obtained for adsorption?

Related Mcqs:

1. 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

2. 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

3. 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

4. In the desorption of highly soluble gas from the liquid, the main resistance will be in the ______________ phase?

   A. Gas
   B. Liquid
   C. Both A. & B.
   D. Neither A. nor B.

5. Which of the following can be calculated theoretically using steam table and Dalton’s law of partial pressure; if the relative humidity and dry bulb temperature of moist air is known ?

   A. Dew point
   B. Humidity ratio
   C. Wet bulb temperature
   D. None of these

6. The process employing desorption of the absorbed solute by a solvent is called____________________?

   A. Elution
   B. Osmosis
   C. Reverse osmosis
   D. Sublimation

7. In McCabe-Thiele method of theoretical plate calculation for a distillation column, the operating lines of stripping and rectifying sections coincide with the diagonal at ________________ reflux ?

   A. Total
   B. Minimum
   C. Operating
   D. Maximum permissible

8. 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

9. Out of the following gas-liquid contacting devices, for a given set of operating conditions, gas pressure drop is the least in ______________ tower?

   A. Wetted wall
   B. Bubble cap
   C. Perforated tray
   D. Packed

10. Chemisorption (chemical adsorption) is_______________________?

    A. Same as “Van der Waals” adsorption
    B. Characterised by adsorption of heat
    C. An irreversible phenomenon
    D. A reversible phenomenon