`CO_(2)` is collected by upward displacement of air and `O_(2)` is collected by downward displacement of water. Justify

Explanation

To justify why carbon dioxide (CO₂) is collected by upward displacement of air and oxygen (O₂) is collected by downward displacement of water, we can break down the explanation into several steps:

### Step-by-Step Solution:

1. **Understanding the Collection Methods**:
- Carbon dioxide is collected by **upward displacement of air**.
- Oxygen is collected by **downward displacement of water**.

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