Have you ever peeped into the store room of your home

Have you ever peeped into the store room of your home ? If you have, you must have seen some old and out of use articles made of iron. They are usually covered with a reddish layer. Do you know what red layer is called ?

Ans. The reddish brown colour is deposited over the surface of iron is because of oxidation i.e. formation of Fe2O3.H2O.