A chemist studied the phenomenon of adsorption by putting blood charcoal in `KCL` solution. He observed difference in the behaviour with dilute `KCL` solution and with concentrated `KCL` solution. He also studied the adsorption of different gases on solid adsorbent and the effect of temperature on adsorption. He put forward a mathematical relationship relating `x//m` with equilibrium pressure.
Which of the following is correct ?

Options

A. Adsorption is always exothermic?
B. Adsorption is always endothermic.
C. Physical adsorption is endothermic whereas chemisorption is exothermic.
D. Chemical adsorption is endothermic whereas physical adsorption is endothermic

Answer

A

Explanation

Adsorption is always exothermic.