Question

why isn't rusting called combustion?

Answer 1

in rusting there is a participation of both h2o and o2

and in combustion there is only need of o2

Answer 2

Rusting is not called combustion because rusting of iron is an exothermic process as heat is released during rusting whereas combustion is a chemical change in which a substance reacts with oxygen and give out energy in the form of heat or light.

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