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Which of the following statements is incorrect regarding physisorptions?
(a) More easily liquefiable gases are adsorbed readily.
(b) Under high pressure it results into multimolecular layer on adsorbent surface.
(c) Enthalpy of adsorption ( .ΔH_adsorption ) is low and positive.
(d) It occurs because of van der Waal's forces.

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