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

Related Mcqs:

1. 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

2. 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?

   A. Lower than
   B. Higher than
   C. Same as
   D. Either same or higher than

3. 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

4. Pick out the wrong statement. Generally for physical adsorption, a gas of________________?

   A. Higher molecular weight is adsorbed in preference to a gas of low molecular weight
   B. High critical temperature is adsorbed in preference to a gas of low critical temperature
   C. Low volatility is adsorbed in preference to a gas of high volatility
   D. None of these

5. Physical absorption is__________________?

   A. An irreversible phenomenon
   B. A reversible phenomenon
   C. Accompanied by evolution of heat
   D. Both B. and C.

6. Which of the following processes is not an example of adsorption applied to gaseous separations ?

   A. Recovery of valuable solvent vapors from dilute mixture with air and other gases
   B. Dehumidification of air and gas
   C. Removal of objectionable odour and impurities from industrial gases
   D. Decolouration of yellow glycerine

7. 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

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. __________________ is concerned with the adsorption equilibria?

   A. Fick’s law
   B. Gibb’s equation
   C. Freundlich equation
   D. None of these

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