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Which one of the following characteristics is associated with adsorption?
A
$\Delta G$, $\Delta H$ and $\Delta S$ all are negative.
B
$\Delta G$ and $\Delta H$ are negative but $\Delta S$ is positive.
C
$\Delta G$ and $\Delta S$ are negative but $\Delta H$ is positive.
D
$\Delta G$ is negative but $\Delta H$ and $\Delta S$ are positive.
The answer is A.