# Which one of the following characteristics is associated with adsorption? Option 1) G is negative but H and S are positive Option 2) G, H and S all are negative Option 3) G and H are negative but S is positive Option 4) G and S are negative but H is positive

As learnt in

Change in Q during adsorption -

$\Delta$Q=$\Delta$H - T$\Delta$S

- wherein

$\Delta$Q can be negative if $\Delta$H is sufficiently high negative value as -T$\Delta$S is positive. In an adsorption process which is spontaneous, a combination of these two factors make $\Delta$G negative.

Absorption is a spontaneous process. So in the equation,

$\Delta G=\Delta H -T \Delta S,$

$\Delta G$ will be negative.

$\Delta H$ will be negative because it is an exothermic reaction.

$\Delta S$ will be negative because randomness of the universe decreases in the process.

Option 1)

G is negative but H and S are positive

This option is incorrect.

Option 2)

G, H and S all are negative

This option is correct.

Option 3)

G and H are negative but S is positive

This option is incorrect.

Option 4)

G and S are negative but H is positive

This option is incorrect.

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