You must have observed that
Iron articles are shiny when newer
And coated with a reddish Brown powder when left for little time.These process is commonly
known like rusting of iron.
Some another metals also get
tarnished on this manner.
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Answer:
Rusting is corrosion of iron articles caused by the action of moisture in the air.
4Fe + 3O2 + 2xH20 ----> 2Fe2O3•xH20
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