1.

Which one of the following characteristics is associated with adsorption ?

Answer»

`DeltaG and DeltaH` are NEGATIVE but `DeltaS` is positive
`DeltaG and DeltaS` are negative but `DeltaH` is positive
`DeltaG` is negative but `DeltaHand DeltaS` are positive
`DeltaG, DeltaHand DeltaS` all are negative

Solution :As the MOLECULES of the adsorbate are held on the SURFACE of the solid ADSORBENT, netropy decreases, i.e., `DeltaS` is -ve.
As adsorption is a spontaneous process, `DeltaG=-ve.`
Now as `DeltaG=DeltaH-T DeltaS` is -ve, `DeltaG` can be-ve only if `DeltaH` is -ve.


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