1.

Which of the following statemets is correct for the spontaneous adsorption of a gas ?

Answer»

`DeltaS` is negative and, therefore, `DELTAH` should be highly POSITIVE
`DeltaS` is negative and, therefore, `DeltaH` should be highlt negative
`DeltaS` is positive and, therefore, `DeltaH` should be negative
`DeltaS` is positive and, therefore, `DeltaH` should also be highly positive

Solution :From Gibbs-Helmholtz equation, `DELTAG=DeltaH-T DeltaS` During ADSORPTION of a gas, entorpy DECREASES, i.e., `DeltaS` is -ve.
For spontaneous adsorption, `DeltaG` should be -ve. This is possible only if `DeltaH` is highly negative.


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