1.

Which one of the following characteristics are 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 `DeltaH and DeltaS` are positive
`DeltaG, DeltaH and DeltaS` all are negative

Solution :Adsorption leads to decreases in randomness ( entropy ) i.e., `DeltaS LT 0` for the adsorption to occur , `DeltaG` should be `-ve `.We know that `DeltaG=DeltaH-TDeltaS` if ` DeltaS` is -ve , `T DeltaS`is +ve .It MEANS that `DeltaG` will becomenegativeonly when `DeltaH` is -ve and `DeltaH gt TDeltaS`


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