Answer:
Redox reaction (Reduction-oxidation reaction) is simply the addition of oxygen in a reactant (oxidation) & its reduction in any other reactant (reduction).
For example, Fe2O3 + 3CO ⟶ 2Fe + 3CO2 is a redox reaction because Fe gets reduced while CO is oxidised (refer to the attachment).
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Note: Remember that the equation should match the law of conservation of mass which states that the mass of the products should match the mass of the reactants always as energy can neither be gained or reduced.
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Hope it helps ⚜
