Name three gases which cause acid rain.

Explanation

**Step-by-Step Solution:**

1. **Understanding Acid Rain**: Acid rain refers to any form of precipitation (like rain, snow, or hail) that has a lower pH than normal, making it acidic. This phenomenon occurs when certain gases in the atmosphere react with water vapor.

2. **Identifying the Gases**: The primary gases responsible for the formation of acid rain are:
- **Sulfur Dioxide (SO₂)**: This gas is primarily produced from burning fossil fuels, such as coal and oil, and from volcanic eruptions. When it enters the atmosphere, it can react with water vapor to form sulfuric acid (H₂SO₄).
- **Nitrogen Dioxide (NO₂)**: This gas is produced from vehicle emissions and industrial processes. It can react with water vapor to form nitric acid (HNO₃).
- **Chlorine Gas (Cl₂)**: While less common than the first two, chlorine gas can also contribute to acid rain under certain conditions, particularly in coastal areas where it can react with water to form hydrochloric acid (HCl).
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