2.1 Characteristics of Adsorption

2.1 Characteristics of Adsorption
2.2 Types of Adsorption

4.1 Freundlich adsorption isotherm
4.2 The Langmuir adsorption isotherm

7.1 Different Colloidal Systems
7.2 Classification of Colloidal System
7.3 Preparation of Colloidal System
7.4 Purification of Colloidal System
7.5 Properties of colloidal system

8.1 Protective colloids

9.1 Foams
9.2 Applications of colloids and emulsions

10.1 Positive and negative catalysis
10.2 Types of catalysis

12.1 Characteristics of Enzymes
12.2 Mechanism of enzyme catalysis
12.3 Autocatalysis
12.4 Induced catalysis

1. It is specific and selective in nature.

2. It is accompanied by decrease in the free energy of the system. When $\Delta G$ becomes zero, adsorption equilibrium is established.

3. Adsorption is a spontaneous process therefore change in free energy $\left( {\Delta G} \right)$ for the process is negative.

According to Gibbs-Helmholtz equation, $$\Delta G = \Delta H - T\Delta S$$$$\Delta G = - ve;\;\Delta H = - ve$$

Since, it is a exothermic process. $\Delta S$ is negative because adhering of gas molecules to the surface lowers the randomness.