What happens when sulphur dioxide is passed through an aqueous solution of Fe(III) salt?

Explanation

When sulfur dioxide (SO₂) is passed through an aqueous solution of iron(III) salt (Fe³⁺), a redox reaction occurs. Here’s a step-by-step breakdown of the process:

### Step 1: Identify the Oxidation States
- In sulfur dioxide (SO₂), sulfur has an oxidation state of +4.
- In iron(III) salt (Fe³⁺), iron has an oxidation state of +3.

### Step 2: Determine the Reducing and Oxidizing Agents
- Sulfur dioxide (SO₂) acts as a reducing agent because it can be oxidized to a higher oxidation state.
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