A. Fe³+ (H2O)6
B. FeO.H2O
C. Fe2O3.3H2O
D. Fe3O4.2H2O
Correct Answer:
Option C – Fe2O3.3H2O
Explanation
Iron [Fe] reacts with H2 in the presence of oxygen to form a rust.
4Fe + 3O2 → 2Fe2O3
Fe2O3 + H2O → Fe2O3.3H2O
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