Question

Iron (Fe) + Oxygen (O2) + Water (H2O) → ?

Answer 1

Explanation:

Fe + O2 + H2O → Fe2O3•xH2O

Additional information :-

• When a iron object is left in damp air (or water) for a considerable time, it gets covered with a red-brown flaky substance called Rust, and this is called Rusting of Iron.
• During the rusting of iron, iron metal combines with the oxygen of air in the presence of water to form hydrated iron (III) oxide, Fe2O3•xH2O
• The hydrated iron (III) oxide is also called rust.
• Two conditions are necessary for the rusting of iron to take place :-

1. Presence of Air (oxygen)
2. Presence of water (moisture)

• Prevention of Rusting :-

1. Rusting of iron can be prevented by painting.
2. Rusting of iron can be prevented by applying grease or oil.
3. Rusting of iron can be prevented by Galvanisation.

Answer 2

Fe + O2 +H2O - Fe2O3.xH2O

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