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Q.

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

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a

Magnitude of chemisorption increases but 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

answer is C.

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Detailed Solution

Physical adsorption does not involve any energy of activation as there is no chemical bond formation between the adsorbed molecules and the surface (and hence there is no necessity for bonds of adsorbed molecules to be broken).
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Which of the following is not a point of difference between physisorption and chemisorption?