JEE Main 2009 Chemistry question

Which of the following statements is incorrect regarding physissorptions ?

(1)It occurs because of vander Waal's forces.
(2)More easily liquefiable gases are adsorbed readily.
(3)Under high pressure it results into multi molecular layer on adsorbent surface.
(4)Enthalpy of adsorption is low and positive.Correct

Answer: (4)

Solution

Adsorption is exothermic; for physisorption the enthalpy of adsorption is low (20–40

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Question ID VK-039159