The correct statements among the following are:

a.	Micelle formation by soap in an aqueous solution is possible at all temperatures
b.	Micelle formation by soap in an aqueous solution occurs above a particular concentration
3.	On dilution of soap solution micelles may revert to individual ions
4.	Soap solution behaves like a normal strong electrolyte at all concentrations

1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)

The correct statements among the following about solid catalysts is -

1. a and b
2. b and c
3. c and d
4. a and d

At the equilibrium position in the process of adsorption ..........

1.   ΔH > 0

2.   ΔH = TΔS

3.   ΔH > TΔS

4.   ΔH < TΔS

The process that does not occur at the interface of phases is :

1.  Crystallisation

2.  Heterogeneous catalysis

3.  Homogeneous catalysis

4.  Corrosion

The interface that cannot be obtained is 

1. Liquid-liquid

2. Solid-liquid

3. Liquid-gas

The term ‘sorption’ stands for.........

1.  Absorption

2.  Adsorption 

3.  Both absorption and adsorption

4.  Desorption

Extent of adsorption of adsorbate from the solution phase increases with:
1. Increase in amount of adsorbate in solution.
2. Decrease in surface area of adsorbent.
3.  Increase in temperature of solution.
4. Decrease in amount of adsorbate in solution.

Which one of the following is not applicable to the phenomenon of adsorption?

Physical adsorption is not favoured by : 

1. High pressure.

2. Negative $∆$H

3. Higher critical temperature of adsorbate.

4. High temperature.

Extent of physisorption of a gas increases with ......

1. Increase in temperature.

2. Decrease in temperature.

3.  Decrease in surface area of adsorbent.

4.  Decrease in strength of van der Waals’ force.