In acid rain , `SO_(2)` accounts by .

Options

A. 0.7
B. 1
C. 0.5
D. 0.3

Answer

To solve the question regarding the contribution of sulfur dioxide (SO₂) in acid rain, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Acid Rain**:
- Acid rain refers to any form of precipitation (rain, snow, sleet, or hail) that has a lower pH than normal rainwater. This is primarily due to the presence of sulfur dioxide (SO₂) and nitrogen oxides (NOₓ) in the atmosphere.

2. **Identifying the Role of SO₂**:
- Sulfur dioxide is a significant contributor to acid rain. When SO₂ is released into the atmosphere, it can react with water vapor, oxygen, and other chemicals to form sulfuric acid (H₂SO₄), which lowers the pH of rainwater.

3. **Analyzing the Options**:
- The question provides four options regarding the percentage of SO₂ in acid rain, which are:
- a) 0.7
- b) 0.5
- c) 0.3
- We need to determine which option correctly represents the proportion of SO₂ in acid rain.

4. **Determining the Correct Answer**:
- According to the information provided, sulfur dioxide accounts for approximately 70% of the components that lead to acid rain. In decimal form, 70% is equivalent to 0.7.
- Therefore, the correct answer is option a) 0.7.

5. **Final Answer**:
- The answer to the question "In acid rain, SO₂ accounts by" is **0.7**.