Which of the following gases present in a polluted area will be absorbed most easily on the charcoal gas mask ?

Options

A. `H_(2)`
B. `O_(2)`
C. `N_(2)`
D. `SO_(2)`

Explanation

To determine which gas is absorbed most easily on a charcoal gas mask, we need to consider the properties of the gases involved and how they interact with charcoal.

### Step-by-Step Solution:

1. **Understanding Absorption**:
- Absorption is the process where one substance becomes incorporated into another. In the context of a charcoal gas mask, we are interested in how well different gases can be absorbed by charcoal.

2. **Properties of Gases**:
- Gases that are easily liquefiable tend to be absorbed more effectively by solids like charcoal. This is because they can interact more readily with the surface of the charcoal.

3. **Identifying Gases**:
- Common gases that might be present in a polluted area include:
- Carbon Dioxide (CO2)
- Water Vapor (H2O)
- Ammonia (NH3)
- Sulfur Dioxide (SO2)

4. **Critical Temperature**:
- The critical temperature of a gas is the temperature above which it cannot be liquefied, regardless of the pressure applied. Gases with higher critical temperatures are generally more easily absorbed.
- Among the gases listed, SO2 has a relatively high critical temperature compared to CO2, H2O, and NH3.

5. **Conclusion**:
- Based on the properties of the gases and their critical temperatures, Sulfur Dioxide (SO2) is absorbed most easily on the charcoal gas mask.

### Final Answer:
- The gas that will be absorbed most easily on the charcoal gas mask is **Sulfur Dioxide (SO2)**.