Gaseous pollutants can be controlled by:

Options

A. Adsorption
B. Incineration
C. Purolysis
D. None of the above

Answer

**Step-by-Step Solution:**

1. **Understanding Gaseous Pollutants**:
- Gaseous pollutants are harmful substances in the air that can come from various sources, including industrial emissions, vehicle exhaust, and other human activities.

2. **Identifying Control Methods**:
- The question asks for methods to control gaseous pollutants. We have four options to evaluate:
1. Adsorption
2. Incineration
3. Sterilization
4. None of the above

3. **Evaluating Adsorption**:
- Adsorption is a process where atoms, ions, or molecules from a gas, liquid, or dissolved solid adhere to a surface.
- This process is effective in capturing gaseous pollutants, as it allows for the removal of harmful gas molecules from the air by binding them to a solid surface.
- Therefore, adsorption is a valid method for controlling gaseous pollutants.

4. **Evaluating Incineration**:
- Incineration is a waste treatment process that involves burning organic materials at high temperatures.
- While it can reduce the volume of waste, it does not specifically target gaseous pollutants in the air. Instead, it can produce additional gaseous emissions, making it an ineffective method for controlling gaseous pollutants.

5. **Evaluating Sterilization**:
- Sterilization typically refers to the process of eliminating all forms of life and biological agents from a surface or medium.
- This method is not designed to control gaseous pollutants and is therefore not applicable in this context.

6. **Conclusion**:
- Based on the evaluations, the only effective method for controlling gaseous pollutants from the options provided is adsorption.
- Thus, the correct answer is **adsorption**.

**Final Answer**: Gaseous pollutants can be controlled by **adsorption**.

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