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Give an example where physisorption chan...

Give an example where physisorption changes to chemisorption with rise in temperature. Explain.

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The process of adsorption of H, gas on the surface of finely divided nickel is an example of physisorption, which involves weak van der Waals' forces. However, with rise in temperature, the hydrogen molecules dissociate into hydrogen atoms, which are held on the surface by chemisorption
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