Which of the following is not the property of physi-sorption -
Answers
Answer:If the accumulation of gas on the surface of a solid occurs on account of weak van der Waals’ forces, the adsorption is termed as physical adsorption or physisorption.
Various properties of Physisorption are-
Lack of specificity: A given surface of an adsorbent does not show any preference for a particular gas as the van der Waals’ forces are universal.
Nature of adsorbate: The amount of gas adsorbed by a solid depends on the nature of gas.
Reversible nature: Physical adsorption of a gas by a solid is generally reversible.
The surface area of adsorbent: The extent of adsorption increases with the increase of the surface area of the adsorbent
Enthalpy of adsorption: Physical adsorption is an exothermic process but its enthalpy of adsorption is quite low the reason being the attraction between gas molecules and the solid surface is only due to weak van der Waals’ forces.
Explanation: