Sulphur dioxide can also dissolve in rain water to form sulphuric acid leading to a harmful precipitation called ___.

Options

A. Global warming
B. Eutrophication
C. Greenhouse gas
D. Acid rain

Answer

To answer the question, "Sulphur dioxide can also dissolve in rain water to form sulphuric acid leading to a harmful precipitation called ___," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Reaction**:
- Sulphur dioxide (SO₂) is a gas that can dissolve in water. When it comes into contact with rainwater, it undergoes a chemical reaction.
- The reaction can be summarized as:
\[ \text{SO}_2 + \text{H}_2\text{O} \rightarrow \text{H}_2\text{SO}_3 \]
- This forms sulphurous acid (H₂SO₃). However, sulphur dioxide can further oxidize in the atmosphere to form sulphuric acid (H₂SO₄).

2. **Formation of Sulphuric Acid**:
- The sulphurous acid can be further oxidized to sulphuric acid:
\[ \text{H}_2\text{SO}_3 + \text{O}_2 \rightarrow \text{H}_2\text{SO}_4 \]
- Thus, the presence of oxygen in the atmosphere allows for the formation of sulphuric acid.

3. **Harmful Precipitation**:
- When sulphuric acid is formed in the atmosphere, it can mix with rainwater and fall to the ground as precipitation.
- This type of precipitation is known as "acid rain."

4. **Conclusion**:
- Therefore, the harmful precipitation formed from the dissolution of sulphur dioxide in rainwater, leading to the formation of sulphuric acid, is called **acid rain**.

### Final Answer:
The harmful precipitation is called **acid rain**.

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