A) It occurs because of van der Waal?s forces.
B) More easily liquiefiable gases are adsorbed readily
C) Under high pressure it results into multi molecular layer on adsorbent surface
D) Enthalpy of adsorption (DHadorption) is low and positive.
Correct Answer: D
Solution :
Enthalpy of adsorption in physisorption is negative \[\Delta G=\Delta H-T\Delta S\] As the entropy decreases\[(\Delta S=ve)\] the DH must be negative having a high magnitude. Therefore, the spontaneous adsorption will have negative enthalpy change.
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