Write the chemical test to identify the following gases.
`SO_2`

Explanation

To identify the presence of sulfur dioxide (SO₂) gas, we can perform a chemical test using potassium permanganate (KMnO₄) solution. Here’s the step-by-step solution:

### Step-by-Step Solution:

1. **Prepare Potassium Permanganate Solution**:
- Take a small amount of potassium permanganate (KMnO₄) and dissolve it in water to prepare a dilute solution. The solution will appear deep purple in color due to the presence of KMnO₄.

2. **Pass SO₂ Gas Through the Solution**:
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