Combustion reaction is "a reaction in which a substance reacts with oxygen gas, releasing energy in the form of heat and light. Combustion reactions must involve Oxygen as one reactant".
What is reactants?
Reactants are "the starting materials in a chemical reaction".
What is Oxygen?
Oxygen is "a non-metallic chemical element of Group 16 (VI a, or the oxygen group) of the periodic table".
Hence, from the above chemical reactions, 4Fe + 3O2 → 2Fe2O3 is a combustion reaction.
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