Iron is oxidized to form rust. Hence, option C is correct.
A chemical reaction that takes place between an oxidizing substance and a reducing substance.
Chemical reaction: Fe + O₂ → Fe₂O₃.
Oxidation half reaction:
Fe⁰ → Fe⁺³ + 3e⁻
4Fe⁰ → 4Fe⁺³ + 12e⁻
Reduction half-reaction:
O₂⁰+ 4e⁻ → 2O⁻²
3O₂⁰+ 12e⁻ → 6O⁻²
Balanced chemical reaction:
4Fe + 3O₂ → 2Fe₂O₃.
Oxidation is an increase of oxidation number, iron is oxidized from oxidation number 0 (Fe) to oxidation number +3 (in rust Fe₂O₃).
Learn more about redox reaction here:
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