In the smelting of iron from iron oxide according to the equation Fe₂O₃(s)+ 3 CO(g)$\to$2 Fe(s)+ 3 CO₂(g),what is the change in oxidation number for iron?

Question

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In the reaction, iron in Fe2O3 has an oxidation state of +3. In the product, Fe, iron has an oxidation state of 0. The change in oxidation number for iron is from +3 to 0, which is a decrease of 3.

In the Smelting of Iron from Iron Oxide According to the Equation