What is adsorption ? Explain different types of adsorptions with suitable examples.

Explanation

The process of concentration of molecules of gas (or ) liquid on the surface of another substance is called adsorption . Adsorption is of two types, (a) Physical adsorption (b) Chemical adsorption .
a) Physical adsorption : It is also called Vander waals adsorption . A very weak Vander forces of attraction exists between adsorbate and adsorbent . It is multi layered and non-selective.
Ex : Adsorption of inert gases on activated coconut charcoal.
b) Chemical adsorption : It is also called chemisorption . A very strong chemical forces of attraction exists between adsorbate and adsorbent. it is mono-layered and highly selective.
Ex : Adsorption of `H_(2)` gas on nickel surface.