Which one of the following is not applicable to the phenomenon of adsorption?

1.     Δ H > 0 
2.     Δ G < 0
 3.    Δ S < 0
 4.     Δ H < 0  

 
 
  (a) For phenomenon of adsorption H < 0, i,e, enllidluy change during phenomenon of adsorption is negative because, during adsorption, there is always a decrease in residual forces of the surface which lead to decrease in surface energy which appears as heat.
So, adsorption is an exothermic process and AH <0.