Which of the following statement is not correct? (a) Physical adsorption is due to van der Waals...

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Which of the following statement is not correct?
(a) Physical adsorption is due to van der Waals' forces
(b) Physical adsorption is irreversible
(c) Chemical adsorption increases with increase in temperature upto certain limit than decreases
(d) Enthalpy of adsorption (| \( \Delta H \mid) \) for a chemical adsorption is greater than that of physical adsorption
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