Write the complete set of reactions occuring in the zone of reduction in the blast furnace, in the metallurgy of iron.

Explanation

To write the complete set of reactions occurring in the zone of reduction in the blast furnace during the metallurgy of iron, we can outline the following steps:

### Step 1: Reaction of Iron(III) Oxide with Carbon Monoxide
The first reaction occurs when iron(III) oxide (Fe₂O₃) is reduced by carbon monoxide (CO) to form iron(II,III) oxide (Fe₃O₄) and carbon dioxide (CO₂).

**Reaction:**
\[ \text{Fe}_2\text{O}_3 + 3\text{CO} \rightarrow \text{Fe}_3\text{O}_4 + 3\text{CO}_2 \]

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