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Which of the following statements is correct for the spontaneous adsorption of a gas?
A
$\Delta S$ is negative and, therefore, $\Delta H$ should be highly positive
B
$\Delta S$ is negative and therefore, $\Delta H$ should be highly negative
C
$\Delta S$ is positive and, therefore, $\Delta H$ should be negative
D
$\Delta S$ is positive and, therefore, $\Delta H$ should also be highly positive
Detailed Solution
During adsorption entropy decreases, so $\Delta S < 0$.
$\Delta G = \Delta H - T\Delta S$
For spontaneous adsorption $\Delta G < 0$, so $\Delta H$ should be highly negative.
$\Delta G = \Delta H - T\Delta S$
For spontaneous adsorption $\Delta G < 0$, so $\Delta H$ should be highly negative.