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Chemisorption

Chemisorption...

Question

Chemisorption said to be irreversible but the graph between temperature and chemisorption decrease after the activation energy indicating desorption? Why?

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Solution

It is irreversible because of the formation of new bonds.

and it also decreases on increasing the temperature.

Irreversible does not mean that it cannot increase or decrease with respect to temperature.

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Q. The correct statement(s) pertaining to the adsorption of a gas on a solid surface is(are):
(i) adsorption is always exothermic.

(ii) physisorption may transform into chemisorption at high temperature.
(iii) physisorption increases with increasing temperature but chemisorption decreases with increasing temperature.
(iv) chemisorption is more exothermic than physisorption, however, it is very slow due to the higher energy of activation.

Q. Assertion :In chemisorption, adsorption first increases with temperature and then decreases. Reason: Heat keeps on providing more and more activation energy.

Chemisorption needs activation energy.

Q. Assertion :In chemisorption, adsorption keeps on increasing with temperature. Reason: Heat keeps on providing more and more activation energy.

Chemisorption is irreversible.

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