Device used to separate both particulate matter and gases from polluted air is

Options

A. Scrubbers
B. Arresters
C. Porous Filters
D. Chimneys

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for a device that can separate both particulate matter and gases from polluted air.

2. **Analyzing the Options**: We have four options to consider:
- **Option 1: Scrubbers**
- **Option 2: Arrestors**
- **Option 3: Porous filters**
- **Option 4: Chimneys**

3. **Evaluating Option 1 (Scrubbers)**: Scrubbers are known as air pollution control devices that utilize liquid to remove both particulate matter and gases from industrial exhaust. They can effectively clean the air by trapping pollutants in the liquid.

4. **Evaluating Option 2 (Arrestors)**: Arrestors are devices that primarily serve to stop electrical surges or limit voltage. They do not have any function related to air pollution control, making this option incorrect.

5. **Evaluating Option 3 (Porous filters)**: Porous filters operate on the size exclusion principle and are effective for filtering particulate matter. However, they do not filter gases, which makes this option unsuitable for the question.

6. **Evaluating Option 4 (Chimneys)**: Chimneys are structures that help to vent exhaust gases from stoves or fireplaces into the atmosphere. They do not separate particulate matter, which makes this option incorrect as well.

7. **Conclusion**: After evaluating all options, the only device that effectively separates both particulate matter and gases from polluted air is **Option 1: Scrubbers**.

**Final Answer**: The device used to separate both particulate matter and gases from polluted air is **Scrubbers**.

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