As complete saturation of an adsorbent is approached, the differential heat of adsrop-tion approaches ____________________?

Related Mcqs:

1. In case of an unsaturated mixture of gas and vapor, the percentage saturation is __________________ its relative saturation?

   A. Lower than
   B. Higher than
   C. Equal to
   D. Either A. or B., depends on the mixture composition

2. Percentage saturation is _______________ the relative saturation?

   A. Always smaller than
   B. Always greater than
   C. Not related to
   D. None of these

3. The change in enthalpy, when a unit quantity of gas is absorbed by relatively large quantity of adsorbent (on which a definite concentration of the adsorbed gas already exists) is termed as the_________________?

   A. Differential heat of adsorption
   B. Heat of wetting
   C. Integral heat of adsorption
   D. None of these

4. With the lowering of equilibrium pressure, at a given temperature, the amount of adsorbate on the adsorbent ?

   A. Increases
   B. Decreases
   C. Remain same
   D. Either A. or B., depends on the system

5. At a given equilibrium pressure, with increase in temperature, the concentration of adsorbed gas on solid adsorbent __________________?

   A. Increases
   B. Decreases
   C. Remains unchanged
   D. Increases exponentially

6. Which of the following adsorbent is used to decolourise yellow glycerine ?

   A. Silica gel
   B. Alumina
   C. Fuller’s earth
   D. Activated carbon

7. Which of the following adsorbent is used in the refining of sugar?

   A. Bone charcoal
   B. Wood charcoal
   C. Silica gel
   D. Activated clay

8. The change in enthalpy per unit weight of adsorbed gas when adsorbed on gas free or “outgassed” adsorbent to from a definite concentration of adsorbate is called its_____________________?

   A. Integral heat of adsorption
   B. Heat of wetting
   C. Differential heat of adsorption
   D. Heat of normal condensation

9. The difference of wet bulb temperature and adiabatic saturation temperature of unsaturated mixture of any system is___________________?

   A. +ve
   B. -ve
   C. Zero
   D. None of these

10. For the air water system under ambient conditions, the adiabatic saturation temperature and the wet bulb temperature are nearly equal, because__________________?

    A. Water has a high latent heat of evaporation
    B. Lewis number is close to unity
    C. They are always equal under all circumstances
    D. Solubility of the components of air in water is very small