What is rust? How is it formed?

  • Rust is an iron oxide, a usually reddish-brown oxide formed by the reaction of iron and oxygen.

  • The nature of rust changes with time, reflecting the slow rates of the reactions of solids.

  • The iron reacts with Moisture present in air and oxygen from the air to form hydrated iron(III) oxide, which we see as rust.

  • Here is the word equation for the reaction

  • Iron + water + oxygen → hydrated iron(III) oxide.

         Fe  + H2O  + O2    Fe2O3·nH2O


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