The factors that influence the adsorption of a gas on a solid is/are:

1. Nature of the gas.

2. Surface area of the solid.

3. Effect of pressure.

4. All of the above.

Why is a finely divided substance more effective as an adsorbent?

1. Small surface area.

2. Large surface area.

3. Weak molecular bonding.

4. Strong molecular bonding.

The probable reasons of the exothermic nature of adsorption is:

The characteristics associated with adsorption are:

1. ∆G, ∆H, and ∆S are all negative.
2. ∆G and ∆H are negative, but ∆S is positive.
3. ∆G and ∆S are negative, but ∆H is positive.
4. ∆G is negative, but ∆H and ∆S are positive.

Which of the following statement is false?

Water vapours can be both adsorbed and absorbed by respectively ?

1. Silica gel and ${\mathrm{CaCl}}_2$

2. Chalk and ${\mathrm{CaCl}}_2$

3. ${\mathrm{CaCl}}_2$ and Silica gel

4. ${\mathrm{CaCl}}_2$ and Chalk