Pollutants released from iron and steel industry are

Options

A. `CO_2,NO_2,H_S`
B. `CO,CO_2,SO_2`
C. `CO_2,SO_3,NO_2`
D. `CO_2,NO,SO_3`

Answer

### Step-by-Step Solution:

1. **Identify the Industry**: The question pertains to the pollutants released from the iron and steel industry.

2. **Understand the Fuels Used**: The primary fuels used in the iron and steel industry are fossil fuels, mainly coke and coal. In some instances, petrol and diesel may also be used.

3. **Determine the Pollutants**: When these fuels are burned, they release various pollutants into the atmosphere. The main pollutants from the combustion of these fuels include:
- Carbon Monoxide (CO)
- Carbon Dioxide (CO2)
- Sulfur Dioxide (SO2)
- Nitrogen Dioxide (NO2)

4. **Analyze the Pollutants**:
- **Carbon Monoxide (CO)**: A toxic gas produced from incomplete combustion of carbon-containing fuels.
- **Carbon Dioxide (CO2)**: A greenhouse gas produced from complete combustion of fossil fuels.
- **Sulfur Dioxide (SO2)**: Produced from the combustion of sulfur-containing fuels, such as coal.
- **Nitrogen Dioxide (NO2)**: Produced from combustion processes, particularly at high temperatures.

5. **Eliminate Incorrect Options**: Based on the analysis, we can eliminate options that do not include the correct pollutants:
- Option 1 does not include any of the relevant pollutants.
- Option 3 includes SO3, which is not typically released directly from the iron and steel industry.
- Option 4 includes Nitrogen Monoxide (NO), which is not the primary pollutant of concern.

6. **Select the Correct Option**: The correct pollutants released from the iron and steel industry are CO, CO2, and SO2. Therefore, the correct answer is option number 2.

### Final Answer:
The pollutants released from the iron and steel industry are Carbon Monoxide (CO), Carbon Dioxide (CO2), and Sulfur Dioxide (SO2).

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