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(B) In the blast furnace,the reduction of iron oxides ($Fe_2O_3$ or $Fe_3O_4$) occurs primarily by carbon monoxide $(CO)$.At lower temperatures $(500-

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$CO$

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(B) In the blast furnace,the reduction of iron oxides ($Fe_2O_3$ or $Fe_3O_4$) occurs primarily by carbon monoxide $(CO)$.At lower temperatures $(500-800 \ K)$,$Fe_2O_3$ is reduced by $CO$ as follows:$3Fe_2O_3 + CO \rightarrow 2Fe_3O_4 + CO_2$$Fe_3O_4 + 4CO \rightarrow 3Fe + 4CO_2$At higher temperatures $(900-1500 \ K)$,the reaction is:$FeO + CO \rightarrow Fe + CO_2$Thus,$CO$ acts as the main reducing agent.

In a blast furnace,iron oxide is reduced by which of the following?

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