why can other chemical reactions be classified as oxidation/reduction reactions?

Question

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Answer 1

If there is any change in oxidation state, then the reaction can be classified as oxidation-reduction.

For instance, in a combustion reaction for any organic compound, carbon is oxidized from a variety of negative oxidation states to +4 in carbon dioxide, while the oxygen used to burn it is reduced from an oxidation state of 0 to -2.