Which one of the following is not a correct P statement? W. (1) Physical adsorption is reversib...

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Which one of the following is not a correct
P statement?

W.
(1) Physical adsorption is reversible in nature
(2) Physical adsorption involves vander Waals forces
(3) Rate of physical adsorption increases with increase of pressure on the adsorbate
(4) High activation energy is involved for physical adsorption
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