Which one of the following oxides produces brown air of reddish brown haze?

Options

A. Oxides of sulphur
B. Oxides of nitrogen
C. Oxides of carbon
D. All of these

Answer

To solve the question, "Which one of the following oxides produces brown air of reddish brown haze?", we will analyze the given options one by one.

### Step-by-Step Solution:

1. **Identify the Options**: The options provided are:
- A) Oxide of Sulphur
- B) Oxide of Nitrogen
- C) Oxide of Carbon
- D) All of these

2. **Analyze Oxide of Sulphur (SO2)**:
- Sulphur dioxide (SO2) is a colorless gas with a pungent odor. It does not produce a reddish brown haze. Therefore, this option can be eliminated.

3. **Analyze Oxide of Nitrogen (NO2)**:
- Nitrogen dioxide (NO2) is a reddish-brown gas. It is known to produce a reddish brown haze in the air, especially when it combines with other aerosols. This option is a strong candidate.

4. **Analyze Oxide of Carbon (CO2)**:
- Carbon dioxide (CO2) is a colorless gas. It does not contribute to any reddish brown haze. Thus, this option can also be eliminated.

5. **Consider the Option "All of these"**:
- Since we have established that only the oxide of nitrogen produces a reddish brown haze, the option "All of these" is incorrect.

6. **Conclusion**:
- Based on the analysis, the oxide that produces a brown air of reddish brown haze is the oxide of nitrogen (NO2).

### Final Answer:
The correct answer is **B) Oxide of Nitrogen**.

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