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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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