What Is The Chemical Reaction Of Rust?

4Fe(s) + 3O₂(g) ---> 2Fe₂O₃(s), this is balanced equation for combining Iron and Oxygen.

4Fe(s) + 3O2(g) ---> 2Fe2O3(s) . X H2O where the value or quantity of hydrogen varies which determines the color of the rust (red, orange yellow, maroon, etc.)

Rusting is an electro chemical reaction,where iron reacts with water and oxygen to form Ferric Oxide