Corrosion of statues and monuments occurs due to

Options

A. Photochemical smog
B. Carbon monoxides
C. Acid rain
D. Methane

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the cause of corrosion in statues and monuments. Corrosion refers to the deterioration of materials due to chemical reactions, often influenced by environmental factors.

2. **Analyzing the Options**: We have several options to consider:
- **Photochemical Smog**: This is primarily associated with air pollution and respiratory issues, not directly with corrosion.
- **Carbon Monoxide**: While harmful to health, it does not contribute to the corrosion of materials.
- **Acid Rain**: This is rain that has been made acidic by pollutants in the atmosphere, particularly sulfur dioxide (SO2) and nitrogen oxides (NO2). These pollutants can lead to the formation of sulfuric acid (H2SO4) and nitric acid (HNO3), which are known to corrode various building materials.
- **Methane**: This is a greenhouse gas and is primarily used as fuel, not related to corrosion.

3. **Identifying the Correct Answer**: Among the options, acid rain is the only one that is known to cause corrosion of statues and monuments. The acids formed from pollutants can react with materials like limestone, sandstone, and marble, leading to their deterioration.

4. **Conclusion**: Therefore, the corrosion of statues and monuments occurs due to acid rain.

**Final Answer**: The corrosion of statues and monuments occurs due to acid rain.

---