What do you observe when : `SO_2` is passed through acidified `KMnO_4`

Explanation

### Step-by-Step Solution:

1. **Understanding the Reactants**:
- Sulphur Dioxide (SO₂) is a gas that acts as a strong reducing agent.
- Acidified Potassium Permanganate (KMnO₄) is a solution that has a characteristic purple color and acts as a strong oxidizing agent when acidified.

2. **Observing the Reaction**:
- When SO₂ is passed through the acidified KMnO₄ solution, a chemical reaction occurs.
...