Which gas will be adsorbed on solid to greater extent?

Options

A. A gas having non polar molecules with lowest critical temperature `(T_c)`
B. A gas having non polar molecules with highest critical pressure `(P_c)`
C. A gas having polar molecules with highest critical temperature `(T_c)`
D. A gas having non polar molecules with lowest critical pressure `(P_c)`

Answer

To determine which gas will be adsorbed on a solid to a greater extent, we need to consider the nature of the gas and its properties, particularly its critical temperature and polarity.

### Step-by-Step Solution:

1. **Understand Adsorption**: Adsorption is the process where gas molecules adhere to the surface of a solid. The extent of adsorption depends on various factors, including the nature of the gas and the solid.

2. **Identify Key Factors**: The primary factors influencing the adsorption of gases on solids are:
- The critical temperature of the gas: Gases with higher critical temperatures are generally more easily liquefied and thus tend to be adsorbed more readily.
- The polarity of the gas: Polar gases tend to have stronger interactions with the solid surface due to dipole-dipole interactions and Van der Waals forces.

3. **Consider the Nature of Gases**: Among the gases being compared, identify which ones are easily liquefiable and have high critical temperatures. Gases that are polar and have high critical temperatures will be adsorbed more effectively.

4. **Evaluate the Options**: If provided with specific gases, compare their critical temperatures and polarities. The gas with the highest critical temperature and that is polar will be the one that is adsorbed to the greatest extent.

5. **Conclusion**: Based on the analysis, the gas that is easily liquefiable, has a high critical temperature, and is polar will be adsorbed on the solid surface to a greater extent.

### Final Answer:
The gas with the highest critical temperature and that is polar will be adsorbed on the solid to a greater extent.