Which of the following dissolved gases are present in drinking water?

Options

A. Oxygen, nitric oxide
B. Oxygen, carbon monoxide
C. Oxygen, carbon dioxide
D. Oxygen, nitrogen

Explanation

To determine which dissolved gases are present in drinking water, we need to analyze the options given:

1. **Identify the options**:
- Option 1: Oxygen, Nitric Oxide
- Option 2: Oxygen, Carbon Monoxide
- Option 3: Oxygen, Carbon Dioxide
- Option 4: Oxygen, Nitrogen

2. **Understand the role of dissolved gases in water**:
- Drinking water can contain various dissolved gases. Among these, oxygen and carbon dioxide are commonly found.

3. **Evaluate each option**:
- **Option 1**: Oxygen and Nitric Oxide - Nitric oxide is not typically found in drinking water.
- **Option 2**: Oxygen and Carbon Monoxide - Carbon monoxide is toxic and not present in safe drinking water.
- **Option 3**: Oxygen and Carbon Dioxide - Both of these gases are commonly dissolved in drinking water and contribute to its freshness.
- **Option 4**: Oxygen and Nitrogen - While nitrogen is present in water, it does not contribute to the freshness of drinking water in the same way as oxygen and carbon dioxide.

4. **Conclusion**:
- The correct answer is **Option 3: Oxygen and Carbon Dioxide**. These gases are essential for the freshness and quality of drinking water.