Which of the following is not a property of chemisorption? 

CONCEPT:

Chemisorption

• Chemisorption, or chemical adsorption, involves the formation of a chemical bond between the adsorbate and the surface of the adsorbent.
• This type of adsorption is typically highly specific to the adsorbate and adsorbent involved.
• Chemisorption usually has a high enthalpy of adsorption due to the chemical bond formation.
• It is generally irreversible because the process involves breaking and forming of chemical bonds.

EXPLANATION:

• We know that chemisorption involves specific interactions between the adsorbate and the surface, which means it is highly specific.
• It also has a high enthalpy of adsorption due to the formation of strong chemical bonds.
• Additionally, chemisorption is generally irreversible because breaking these bonds requires significant energy.
• Therefore, the statement "Lack of specificity" does not describe chemisorption.

Therefore, the correct answer is Lack of specificity.