Physisorption And Chemisorption

To determine which statement is not true for physisorption, we must consider the characteristics of physisorption:

• Non-specific in nature: Physisorption, or physical adsorption, occurs due to weak van der Waals forces and can happen on any kind of surface.
• Reversible in nature: Because the forces involved are weak, physisorption can be easily reversed by changing conditions like pressure or temperature.
• Low enthalpy of adsorption: The process involves weak interactions, so the enthalpy of adsorption is low, typically in the range of 20-40 kJ/mol.
• Not due to chemical bonds: Physisorption does not involve the formation of new chemical bonds, unlike chemisorption, which involves chemical bonding.

Given the options and the characteristics listed, the statement "Chemical bond is responsible" is not true for physisorption. Therefore, this option correctly identifies the incorrect statement about physisorption.