Assertion: Chemisorption involves high energy of activation. Reason: Molecules of hydrogen dissociate to form hydrogen atom which is held on the surface by chemisorption. (ii) Assertion: Easily liquefiable gases are readily absorbed.
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both assertion and reason are correct
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Chemisorption requires high activation energy and referred to as activated adsorption.
A physical adsorption at low temperature may pass into chemisorption as the temperature is increased. For example, dihydrogen is first adsorbed on nickel by van der Waals' forces. Molecules of hydrogen then dissociate to form hydrogen atoms which are held on the surface by chemisorption.
Hence, both assertion and reason are correct and the reason is correct explanation for assertion.
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