Write a non - exothermic reaction takind place in the blast furnace during extraction of iron.

Explanation

To answer the question regarding a non-exothermic reaction taking place in the blast furnace during the extraction of iron, we can follow these steps:

### Step 1: Identify the Process
The blast furnace is used for the extraction of iron from its ore, primarily iron(III) oxide (Fe₂O₃). The process involves several reactions, some of which are exothermic (release heat) and some are endothermic (absorb heat).

### Step 2: Recognize Non-Exothermic Reactions
A non-exothermic reaction can be either an endothermic reaction or a reaction that does not release heat. In the context of the blast furnace, we can consider the thermal decomposition of calcium carbonate (CaCO₃) as a non-exothermic reaction.

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