A) \[F{{e}_{2}}{{O}_{3}}\]
B) \[F{{e}_{3}}{{O}_{4}}\]
C) \[FeO\]
D) \[F{{e}_{2}}{{O}_{4}}\cdot 3{{H}_{2}}O\]
Correct Answer: B
Solution :
Iron is rendered passive due to formation of layer of ferros o-ferric oxide\[(FeO\cdot F{{e}_{2}}{{O}_{3}}\]or\[F{{e}_{3}}{{O}_{4}})\].
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