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Why does physisorption decrease with the …

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Why does physisorption decrease with the increase of temperature

Posted by Swarn Kiran 6 years, 3 months ago

CBSE > Class 12 > Chemistry

3 answers

Jk Verma 6 years, 3 months ago

Gas +solid------------->gas/solid +heat Thus , according to le chatlier's principle on increasing temperature the reaction proceeds in backward direction and favours "desorption". And on decreasing temperature the reaction shifts in backward direction and favours "Adsorption"of gas on solid.

Rakshit Verma 6 years, 3 months ago

In physisorption the adsorbents make weak vaan der vaal forces with adsorbate which broke with increase in temperature

Yogita Ingle 6 years, 3 months ago

Adsorption is an exothermic process. Heat is releases whenever molecules are adsorbed on the surface. So, rate of adsorption decreases whenever temperature is increases. This due to the fact that, when temperature is increases, the kinetic energy of adsorbed molecules gets increased and they overcome the electrostatic force of attraction by the adsorbent surface.

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