A) \[4Fe+3{{O}_{2}}+x{{H}_{2}}O\to 2F{{e}_{2}}{{O}_{3}}.x{{H}_{2}}O\]
B) \[Fe+{{H}_{2}}S{{O}_{4}}\to FeS{{O}_{4}}+{{H}_{2}}\]
C) \[2F{{e}_{3}}{{O}_{4}}+{{H}_{2}}O\to 3F{{e}_{2}}{{O}_{3}}+{{H}_{2}}\]
D) \[2FeS{{O}_{4}}\to F{{e}_{2}}{{O}_{3}}+S{{O}_{2}}+S{{O}_{3}}\]
Correct Answer: A
Solution :
Iron reacts with moist air and forms \[F{{e}_{2}}{{O}_{3}}\] that is the formation of rust.
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