Which of the following is a characteristic of chemisorption? (a) It is reversible (b) It is non-...

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Which of the following is a characteristic of chemisorption?
(a) It is reversible
(b) It is non-specific
(c) It is multilayer phenomenon
(d) Heat of adsorption is about \( -400 \mathrm{~kJ} \mathrm{~mol}^{-1} \)
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