Explain the following terms related to Adsorption Chromatography:
$(a)$ Principle of Adsorption chromatography.
$(b)$ Adsorbent.
$(c)$ Mobile phase.
$(d)$ Adsorbate.

(N/A) Principle: This method is based on the differential adsorption of various components of a mixture on a suitable adsorbent to different degrees.
$(b)$ Adsorbent: The solid substance on whose surface the components are adsorbed is called an adsorbent. Examples include $Silica \ gel$ and $Alumina$. It acts as the stationary phase.
$(c)$ Mobile phase: The liquid solvent or gas that flows over the stationary phase (adsorbent) and carries the components of the mixture is known as the mobile phase.
$(d)$ Adsorbate: The substance or mixture of substances that gets adsorbed onto the surface of the adsorbent is called the adsorbate. These components migrate at different rates depending on their affinity for the stationary phase and the mobile phase,leading to their separation.