A) \[F{{e}_{2}}{{O}_{3}}\text{.}{{\text{H}}_{2}}O~\]
B) \[F{{e}_{2}}{{O}_{3}}\text{.5}{{\text{H}}_{2}}O~\]
C) \[F{{e}_{2}}{{O}_{3}}\text{.x}{{\text{H}}_{2}}O~\]
D) None of these
Correct Answer: C
Solution :
The chemical formula of rust is \[F{{e}_{2}}{{O}_{3}}.x{{H}_{2}}O\]
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