Question

Which among the following is a false statement?

• A. Adsorption is a thermodynamically favorable process
• B. Adsorption is an entropically favorable process
• C. Adsorption is an enthalpically favorable process
• D. Adsorption process is always favorable in dark condition

Hint:

Adsorption leads to a decrease in randomness, so $\Delta S$ is always negative.

Answer 1

The Correct Option is B

Step 1: Concept
Thermodynamics of adsorption.
Step 2: Meaning
During adsorption, the movement of gas molecules is restricted as they settle on the surface.
Step 3: Analysis
- $\Delta G$ is negative (process is spontaneous/favorable). - $\Delta H$ is negative (exothermic/enthalpically favorable). - However, since the randomness of the molecules decreases, $\Delta S$ (entropy) is negative. A negative $\Delta S$ means the process is entropically unfavorable.
Step 4: Conclusion
Statement (B) is false.
Final Answer:(B)