Red-ox Reaction

Q: Why the following reaction is known as red-ox reaction? Why it is not only known as either reduction or oxidation reaction?
                      FeO + CO----------> Fe + CO2

Ans:    Because oxidation and reduction reactions occur simultaneously in any reaction, e.g. in the above reaction, Fe is reduced from Fe2+ to Fe0 and C is oxidized from C2+ to C4+ while the oxidation number of oxygen is -2 on both the sides.

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