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State two conditions necessary for rusti...

State two conditions necessary for rusting of iron.

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Two condition necessary for rusting of iron are
(i) Reaction with moist air : When iron is exposed to moist air, it form a layer of brown hydrated ferric oxide on its surface . This compound is known as rust and the phenomenon of formation of rust is known as rusting .
` 4Fe+3O_2+xH_2O to 2Fe_2O_3.xH_2O"(rust)"`
(ii) Water .
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