The air pollutant that not only causes acid rains but also leads to accelerated corrosion of buildings and movements is

Options

A. Carbon dioxide
B. Carbon monoxide
C. Sulphur dioxide
D. Nitrogen oxides

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for an air pollutant that causes acid rain and leads to the corrosion of buildings and monuments.

**Hint**: Identify the key terms in the question, such as "air pollutant," "acid rain," and "corrosion."

2. **Identifying Air Pollutants**: The options provided are Carbon Dioxide, Carbon Monoxide, Sulphur Dioxide, and Nitrogen Oxide. We need to analyze which of these pollutants is known to cause acid rain.

**Hint**: Recall the common air pollutants and their effects on the environment.

3. **Analyzing Each Option**:
- **Carbon Dioxide**: While it contributes to global warming, it is not primarily responsible for acid rain.
- **Carbon Monoxide**: This gas is harmful but does not cause acid rain.
- **Sulphur Dioxide**: This gas is known to react with water in the atmosphere to form sulfuric acid, leading to acid rain. It is also known to cause corrosion of buildings and monuments.
- **Nitrogen Oxide**: This can contribute to acid rain but is not as significant as Sulphur Dioxide in terms of corrosion.

**Hint**: Focus on the specific effects of each pollutant regarding acid rain and corrosion.

4. **Conclusion**: Based on the analysis, Sulphur Dioxide is the air pollutant that causes acid rain and leads to the corrosion of buildings and monuments.

**Hint**: Summarize your findings to arrive at the final answer.

5. **Final Answer**: The correct answer is **Sulphur Dioxide**.

**Hint**: Ensure you can explain why Sulphur Dioxide is the correct choice based on its properties and effects.