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Give an example where physisorption chan...

Give an example where physisorption changes to chemisorption with rise in temperature. Explain the reason for change.

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Adsorption of `H_2` on finely divided nickel (physisorption) involves weak van der Waal.s forces. When temperature is increased, hydrogen molecules dissociate into hydrogen atoms form chemical bonds with the metal atoms at the surface (chemisorption).
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