Write balanced chemical equations for the preparation of `SO_2` from a sulfite and sulfide ores.

Explanation

To prepare sulfur dioxide (SO₂) from sulfite and sulfide ores, we can write balanced chemical equations for both processes.

### Step 1: Preparation of SO₂ from Sodium Sulfite
1. **Identify the reactants and products**: Sodium sulfite (Na₂SO₃) reacts with sulfuric acid (H₂SO₄) to produce sulfur dioxide (SO₂), sodium sulfate (Na₂SO₄), and water (H₂O).
2. **Write the unbalanced equation**:
\[ \text{Na}_2\text{SO}_3 + \text{H}_2\text{SO}_4 \rightarrow \text{SO}_2 + \text{Na}_2\text{SO}_4 + \text{H}_2\text{O} \]
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