A) \[F{{e}_{2}}{{O}_{3}}\]
B) FeO
C) \[F{{e}_{3}}{{O}_{4}}\]
D) \[Fe{{(N{{O}_{3}})}_{3}}\]
Correct Answer: C
Solution :
The passivity of iron is due to the formation of a thin insoluble and invisible iron film on surface which prevents its further reactions. The film is due to the formation of \[F{{e}_{3}}{{O}_{4}}\].
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