During the rusting of iron

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metal acts as cathode

hydrogen ion acts as anode

formula of rust is Fe3O4.xH2O

the overall reaction is 2Fe+O2+4H+→2Fe2++2H2O

answer is D.

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Detailed Solution

During rusting of iron, metal acts as anode, hydrogen ion as cathode. The overall reaction is 2Fe+O2+4H+→2Fe2++2H2O Formula of rust is Fe2O3.xH2O.

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