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Comparison of Physisorption and Chemisorption

Which of the ...

Question

Which of the following statements is/are true for physisorption?

A

Extent of adsorption increases with increase in pressure.

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B

It needs activation energy.

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C

It can be reversed easily.

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D

It occurs at high temperature.

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Solution

The correct options are
A Extent of adsorption increases with increase in pressure.
C It can be reversed easily.
In physisorption, the amount of adsorption decreases with the increase of temperature and increases with the increase of pressure.
Also, physisorption happens due to weak attraction forces like van der Waals forces so, it can be reversed easily. Generally, it occurs at low 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. Select the correct statement(s).
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Q. Methylene blue is adsorbed on activated charcoal from its aqueous solution at

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