Which of the following is not characteristic of chemisorption?
A
Adsorption is specific
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B
Heat of adsorption is of die order of 200kJmol−1
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C
Adsorption is irreversible
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D
Adsorption may form multimolecular layers
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Solution
The correct option is C Adsorption may form multimolecular layers Chemisorption is a kind of adsorption which involves a chemical reaction between the surface and the adsorbate. New chemical bonds are generated at the adsorbent surface.
Various characteristics of Chemisorption are-
High specificity: Chemisorption is highly specific and it willonly occur if there is some possibility of chemical bonding between adsorbent and adsorbate.
It is irreversible in nature.
Surface area: Chemisorption increases with the increase of the surface area of the adsorbent.
Enthalpy of adsorption: Enthalpy of chemisorption is high (80−240kJmol−1)) as it involves chemical bond formation.
Chemisorption doesn't form multimolecular layers and hence option D is a correct answer.