Though, theoretically the adsorption & desorption isotherms is expected to coincide but sometimes at least a part of the isotherms does not coincide and this phenomenon is known as adsorption hysteresis. In such cases, the desorption equilibrium pressure is ______________ that obtained for adsorption?
Correct answer: A
Explanation
Adsorption hysteresis means the desorption curve is typically at a lower pressure than the adsorption curve for the same amount of adsorbed gas.