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Surface Chemistry
Which of the following statements is incorrect regarding physissorptions?
It occurs because of vander Waal’s forces.
More easily liquefiable gases are adsorbed readily.
Under high pressure, it results into multimolecular layer on the adsorbent surface.
Enthalpy of adsorption ( ∆Hadsorption) is low and positive
D.
Enthalpy of adsorption ( ∆Hadsorption) is low and positive
Enthalpy of adsorption in physisorption is negative
∆G = ∆H - T∆S
As the entropy decreases (∆S = –ve) the ∆H must be negative having a high magnitude. Therefore, the spontaneous adsorption will have negative enthalpy change.
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