Which oxide of sulfur can act as an oxidising as well as a reducing agent ?

Explanation

To determine which oxide of sulfur can act as both an oxidizing and a reducing agent, we need to analyze the oxidation states of sulfur in its various oxides.

### Step-by-Step Solution:

1. **Identify the Oxides of Sulfur**:
The common oxides of sulfur are sulfur dioxide (SO₂) and sulfur trioxide (SO₃).

2. **Determine the Oxidation States**:
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