The most adsorbed gas on activated chrocal is

Options

A. `N_(2)`
B. `H_(2)`
C. `CO_(2)`
D. `CH_(4)`

Explanation

To determine the most adsorbed gas on activated charcoal, we can analyze the properties of the gases mentioned: N2 (Nitrogen), H2 (Hydrogen), CO2 (Carbon Dioxide), and CH4 (Methane).

### Step-by-Step Solution:

1. **Understanding Adsorption**:
- Adsorption is the process by which atoms, ions, or molecules from a gas, liquid, or dissolved solid adhere to a surface. Activated charcoal has a high surface area, making it an excellent adsorbent.

2. **Properties of Gases**:
- **N2 (Nitrogen)**: A non-polar molecule with a relatively low molecular weight.
- **H2 (Hydrogen)**: Also a non-polar molecule, but it has a very low molecular weight.
- **CO2 (Carbon Dioxide)**: A polar molecule, which can interact more strongly with surfaces due to its dipole moment.
- **CH4 (Methane)**: A non-polar molecule, but larger than N2 and H2.

3. **Comparing Adsorption Strength**:
- Generally, polar molecules tend to be adsorbed more strongly than non-polar molecules due to stronger intermolecular forces (like dipole-dipole interactions).
- Among the gases listed, CO2 is polar, while N2, H2, and CH4 are non-polar.

4. **Conclusion**:
- Based on the properties and the nature of adsorption, CO2 is expected to be the most adsorbed gas on activated charcoal due to its polar nature, which allows for stronger interactions with the surface of the charcoal.

### Final Answer:
The most adsorbed gas on activated charcoal is **CO2 (Carbon Dioxide)**.