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Which of the following is not characteristic of chemisorption?

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Which of the following is not characteristic of chemisorption?

(a) It is irreversible

(b) It is specific

(c) It is multilayer phenomenon

(d) Heat of adsorption is about 400kj

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This interesting question is from Adsorption in division Unit Operations of Bioprocess Engineering

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Correct choice is (c) It is multilayer phenomenon

To explain I would say: Chemisorption involves formation of chemical bonds between adsorbate and adsorbent molecules. Once the valency is satisfied, the adsorbent molecules can’t form bond with more adsorbate molecules. Thus only one layer is formed.

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