Chlorine is used to purify drinking water. Excess of chlorine is harmful. The excess of chlorine is removed by treating with sulphur dioxide. Present a balanced equation for this redox change talking place in water.

Explanation

To present a balanced equation for the redox change taking place in water when excess chlorine is treated with sulfur dioxide, we can follow these steps:

### Step 1: Write the skeletal equation
The initial reaction involves chlorine (Cl2) and sulfur dioxide (SO2) in the presence of water (H2O). The products will be chloride ions (Cl-) and sulfate ions (SO4^2-).

**Skeletal Equation:**
\[ \text{Cl}_2 + \text{SO}_2 + \text{H}_2\text{O} \rightarrow \text{Cl}^- + \text{SO}_4^{2-} + \text{H}^+ \]

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