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Physisorption

A physical ad...

Question

A physical adsorption at low temperature may pass into chemisorption as:

A

Temprarure decrease

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B

Temperature increase

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C

After some time at same temperature

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D

physical adsorption never change into chemisorption

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Solution

The correct option is B Temperature increase
As temperature increases bonds tend to break thus resulting in chemisorption.

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Q. Assertion :Physisorption of a gas adsorbed at low temperature may change into chemisorption at a high temperature. Reason: Usually low pressure is also favourable for chemisorption.

Physical adsorption is high at high temperature while chemical adsorption is high at low temperature.

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

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(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. Low temperature favours physical adsorption and high temperature favours chemical adsorption.

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