Which one of the following is not applicable to the phenomenon of adsorption?

Options

A. `Delta H gt 0`
B. `DeltaG gt 0`
C. `DeltaS lt 0`
D. `DeltaH lt 0`

Explanation

To solve the question "Which one of the following is not applicable to the phenomenon of adsorption?", we need to analyze the properties associated with adsorption.

### Step-by-Step Solution:

1. **Understand the Process of Adsorption**:
- Adsorption is the process where molecules (adsorbate) adhere to the surface of a solid or liquid (adsorbent).

2. **Identify the Nature of the Process**:
- The adsorption process is generally exothermic. This means that it releases heat when it occurs.

3. **Change in Enthalpy (ΔH)**:
- Since adsorption is an exothermic process, the change in enthalpy (ΔH) is negative. Therefore, ΔH < 0.

4. **Change in Entropy (ΔS)**:
- During adsorption, the adsorbate molecules become more ordered as they adhere to the surface. This leads to a decrease in entropy. Thus, ΔS < 0.

5. **Change in Gibbs Free Energy (ΔG)**:
- For a process to be spontaneous, the change in Gibbs free energy (ΔG) must be negative. Since adsorption is a spontaneous process, ΔG < 0.

6. **Evaluate the Options**:
- Now, we need to evaluate the options given in the question:
- **Option 1**: Change in enthalpy is greater than 0 (ΔH > 0) - This is incorrect because ΔH is negative.
- **Option 2**: Change in Gibbs free energy is greater than 0 (ΔG > 0) - This is also incorrect because ΔG is negative.
- **Option 3**: Change in entropy is less than 0 (ΔS < 0) - This is correct as the entropy decreases during adsorption.
- **Option 4**: Change in enthalpy is negative (ΔH < 0) - This is correct as adsorption is exothermic.

7. **Conclusion**:
- The options that are not applicable to the phenomenon of adsorption are Option 1 (ΔH > 0) and Option 2 (ΔG > 0). Since the question asks for one, we can choose either, but typically, the first incorrect option is preferred.

### Final Answer:
The option that is not applicable to the phenomenon of adsorption is **Change in enthalpy is greater than 0 (ΔH > 0)**.