Which of the following is correct regarding adsorption ?

Options

A. `DeltaG` is negative, but `DeltaH` and `DeltaS` are positive
B. `DeltaG` and `DeltaH` are negative, but `DeltaS` is positive
C. `DeltaG` and `DeltaS` are negative, but `DeltaH` is positive
D. `DeltaG` , `DeltaH` , and `DeltaS` are alll negative

Answer

D

Explanation

Adsorption generally occurs with release of energy i.e., it is exothermic in nuture. A spontanceous process like adsorption requires a negative `DeltaG` . Since the translational freedom of the adsorbae is reduced when it is adsobed, `DeltaS` is generally negative.