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Q.

Which one of the following is not a correct statement about physical adsorption.

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a

Physical adsorption is reversible in nature

b

Physical adsorption involves van der Waal’s forces

c

Rate of physical adsorption increases with increase of pressure on the adsorbate

d

High activation energy is involved

answer is D.

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Detailed Solution

In case of Physisorption, The enthalpy of adsorption is low (20 to 40 kJ/mol).
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