Write two uses of `ClO_2`.

Explanation

To answer the question about the uses of Chlorine Dioxide (ClO₂), we can outline the following steps:

### Step-by-Step Solution:

1. **Identify Chlorine Dioxide (ClO₂)**:
- Chlorine Dioxide is a chemical compound with the formula ClO₂. It is a yellowish gas at room temperature and is known for its strong oxidizing properties.

2. **Use as a Water Purification Agent**:
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