Question

what happens if iron burn with air

Answer 1

Iron and Oxygen. This is a very versatile demonstration. It is an example of a formation reaction, a redox reaction, and a combustion reaction. ... As we can see in this demo, however, when iron is subdivided finely it burns readily enough in air.

Answer 2

Iron combusts in air to form various iron oxides, mainly iron(III) oxide: 4 Fe (s) + 3 O2 (g) ==> 2 Fe2O3 (s) Iron in its usual bulk solid form will only burn when in pure oxygen with when a great deal of heat is supplied.
It is an example of a formation reaction.
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Husain ameer