Identify the reaction that does not take place in a blast furnace.

Question

$\text{CaCO}_3 \rightarrow \text{CaO} + \text{CO}_2$

$\text{CaO} + \text{SiO}_2 \rightarrow \text{CaSiO}_3$

$2\text{Fe}_2\text{O}_3 + 3\text{C} \rightarrow 4\text{Fe} + 3\text{CO}_2$

$\text{CO}_2 + \text{C} \rightarrow 2\text{CO}$

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