The rain water becomes acidic due to the reaction of water with :

Options

A. Sulphur dioxide
B. Carbon dioxide
C. Hydrogen
D. Both sulphur dioxide and carbon dioxide

Answer

**Step-by-Step Solution:**

1. **Understanding Acid Rain**: Acid rain refers to precipitation (rain, snow, sleet, or hail) that has a lower pH than normal rainwater. This acidity is primarily caused by the presence of certain pollutants in the atmosphere.

2. **Identifying the Pollutants**: The main pollutants that contribute to the acidity of rainwater are oxides of nitrogen (NOx) and sulfur (SOx). These are gases released into the atmosphere from various sources, including vehicle emissions, industrial processes, and the burning of fossil fuels.

3. **Chemical Reactions**: When rainwater comes into contact with these oxides, chemical reactions occur:
- **Nitrogen Oxides**: When nitrogen oxides dissolve in water, they react to form nitric acid (HNO3).
- **Sulfur Oxides**: Similarly, sulfur oxides react with water to form sulfuric acid (H2SO4).

4. **Formation of Acid Rain**: The presence of these acids in rainwater lowers its pH, making it acidic. This process leads to what is known as acid rain.

5. **Conclusion**: Therefore, the rainwater becomes acidic due to the reaction of water with oxides of nitrogen and sulfur, which form nitric acid and sulfuric acid, respectively.

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