Which of the following oxides are present in acid rain?

Options

A. Phosphorus oxides
B. Sulphur oxides
C. Nitrogen oxides
D. Both (b) and (c)

Explanation

To determine which oxides are present in acid rain, we need to analyze the components that contribute to the formation of acid rain. Acid rain primarily results from the reaction of certain oxides with water in the atmosphere.

### Step-by-Step Solution:

1. **Understanding Acid Rain**: Acid rain is formed when certain gases in the atmosphere react with water to produce acids. The most common acids found in acid rain are sulfuric acid (H₂SO₄) and nitric acid (HNO₃).

2. **Identifying Relevant Oxides**:
- **Sulfur Oxide (SO₂)**: When sulfur dioxide (SO₂) is released into the atmosphere, it can react with water to form sulfuric acid:
\[ SO₂ + H₂O \rightarrow H₂SO₄ \]
- **Nitrogen Oxides (NOₓ)**: Nitrogen oxides, such as nitrogen dioxide (NO₂), can react with water to form nitric acid:
\[ NO₂ + H₂O \rightarrow HNO₃ \]

3. **Examining the Options**:
- **Phosphorus Oxide**: While phosphorus oxides can form acids, they are not the primary contributors to acid rain.
- **Sulfur Oxide**: This oxide is a significant contributor to acid rain as it forms sulfuric acid.
- **Both B and C**: This option suggests that both sulfur oxide and nitrogen oxide contribute to acid rain.

4. **Conclusion**: Based on the reactions and the oxides involved, the correct answer is that both sulfur oxide and nitrogen oxide are present in acid rain.

### Final Answer:
The oxides present in acid rain are **Sulfur Oxide** and **Nitrogen Oxide**. Therefore, the answer is **Option 4: Both B and C are correct**.

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