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