Which of the following pair does not represent greenhouse gases?

Options

A. `CO_(2) and CH_(4)`
B. `CH_(4) and N_(2)O`
C. `O_(3) and SO_(2)`
D. `N_(2) and CFCs`

Answer

To determine which pair does not represent greenhouse gases, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Greenhouse Gases**:
- Greenhouse gases are substances that trap heat in the atmosphere, contributing to the greenhouse effect. Common examples include carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), and chlorofluorocarbons (CFCs).

2. **Analyze Each Pair**:
- **Pair 1: CO2 and CH4**: Both are greenhouse gases. CO2 is carbon dioxide, and CH4 is methane.
- **Pair 2: CH4 and N2O**: Both are greenhouse gases. CH4 is methane, and N2O is nitrous oxide.
- **Pair 3: O3 and SO2**: Ozone (O3) is not primarily considered a greenhouse gas; it protects against UV rays. Sulfur dioxide (SO2) is also not a greenhouse gas.
- **Pair 4: N2 and CFC**: CFCs (chlorofluorocarbons) are greenhouse gases, but nitrogen (N2) is not considered a greenhouse gas.

3. **Identify the Correct Answer**:
- The pair that does not represent greenhouse gases is **O3 and SO2**. Ozone is not a greenhouse gas, and sulfur dioxide is also not classified as one.

4. **Conclusion**:
- Therefore, the correct answer is **Option C: O3 and SO2**.