Physisorption

Give two examples of the following change occurring during a chemical reaction:

Evolution of a gas

The force of attraction between two permanent dipoles is known as

1. Dipole Induced dipole force

2. Dipole-dipole force

3. London force

4. Repulsive force

1. the absorption requires activation at ${25}^{\circ }C$
2. the absorption is accompained by a decreases in enthalpy
3. the absorption increases with increase of temperature
4. the absorption is irreversible.

Interaction energy associated with London force is

1. Proportional to the third power of the distance between two interacting particles

2. Inversely proportional to the third power of the distance between two interacting particles

3. Inversely proportional to the sixth power of the distance between two interacting particles

4. Proportional to the sixth power of the distance between two interacting particles

If the absorbate is held on a surface by weak Vander Waal's forces, the

absorption process is called

[Kerala (Med.) 2002]

1. Physical adsorption

2. Chemical adsorption

3. Heat of adsorption

4. Enthalpy of adsorption