Which of the following statements is not correct? (a) Physical adsorption is due to van der Waal'...

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Which of the following statements is not correct?
(a) Physical adsorption is due to van der Waal's forces
(b) Chemical adsorption first decreases with increase in temperature.
(c) Physical adsorption is reversible
(d) Adsorption energy for a chemical adsorption is generally greater than that of physical adsorption.

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