Question

iron combines with o2 and___________of air to form rust​

Answer 1

Moisture is the answer.

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Answer 2

it occurs when Iron, Oxygen and Water (air moisture) combine. ... When they combine, the iron loses electrons to oxygen atoms. This is called oxidation and when it happens it produces a chemical reaction forming Fe203 Iron Oxide otherwise known as Ferric Oxide, or more commonly known as rust.