The reddish–brown rust on iron roofing sheets consists of
Fe3 + (H2O)6
FeO.H2O
Fe2O3.XH2O
Fe3O4.2H22O
Correct answer is C
Iron [Fe] reacts with H2 in the presence of oxygen to form a rust. 4Fe + 3O2 → 2 Fe2O2 Fe2O3 + H2O → Fe2O3.H2O
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