(C) Physisorption is caused by weak van der Waals forces,so it requires very low activation energy. In contrast,chemisorption involves the formation o

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Activation energy is high for physisorption and low for chemisorption

(C) Physisorption is caused by weak van der Waals forces,so it requires very low activation energy. In contrast,chemisorption involves the formation of chemical bonds,which requires a significant amount of activation energy. Therefore,the statement that activation energy is high for physisorption and low for chemisorption is incorrect.

Class 12 Chemistry Surface Chemistry Adsorption and Adsorption isotherm

Medium

Which of the following is not a point of difference between physisorption and chemisorption?

A
Magnitude of chemisorption first increases then decreases but that of physisorption decreases with rise in temperature
B
Chemisorption is an irreversible process whereas physisorption is reversible in nature
C
Activation energy is high for physisorption and low for chemisorption
D
Physisorption results in the formation of multimolecular layer,while only unimolecular layer is formed in case of chemisorption