Question

Which of the following is always less than zero during adsorption?

• A. $\Delta G$
• B. $\Delta S$
• C. $\Delta H$
• D. All of the above

Answer 1

The correct option is D All of the above

Adsorption is process where randomness decreases and energy is released. Hence, $\Delta S$ will be negative (as randomness is decreasing) and $\Delta H$ will also be negative ($\Delta H$ is negative for exothermic processes).
$\Delta G$ is also must be negative for the adsorption process to occur.