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Q.

Which one of the following is not a correct statement?

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a

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

b

High activation energy is involved.

c

Physical adsorption is reversible in nature

d

Physical adsorption involves vanderwaal’s forces

answer is D.

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Detailed Solution

Physisorption (physical adsorption) arises due to van der Waals’ forces. It is not specific and reversible in nature. Enthalpy of adsorption is low and ranges from 20-40 kJ mol –1. Also, activation energy of physical adsorption is also very low.

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