why iron is cooroded when exposed to moist air
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Corrosion occurs in the presence of moisture. For example when iron is exposed to moist air, it reacts with oxygen to form rust, ... Both water and oxygen are required for the next sequence of reactions. The iron (+2) ions are further oxidized to form ferric ions (iron "+3") ions.
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When iron and its alloys are subjected to moisture for a long period of time ,they undergo oxidation i.e reacts with oxygen present in air ( and water )and formed hydrated iron oxide (Fe2O3.nH2O
We can prevent it by painting iron because it prevents the contact of moist air with iron.
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