Which of the following statements is incorrect regarding physiosorption?

Under high pressure it results into multimolecular layer on adsorbent surface.

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More easily liquefiable gases are adsorbed readily.

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Enthalpy of adsorption

(△ H_{a d s o r p t i o n})

is low and positive.

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It occurs because of van der Waals forces.

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Solution

The correct option is C Enthalpy of adsorption $(△ H_{a d s o r p t i o n})$ is low and positive.
For physiosorption, Enthalpy of adsorption $(△ H_{a d s o r p t i o n})$ is low and negative.

Physiosorption is an exothermic process. Heat is evolved during physiosorption.

Option C is correct

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Chlorine is more easily liquefied than ethane because ("a” and "b" are van der waals constants for gases).

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