Formation of rust is an electrochemical phenomenon. Formula of rust is

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Fe3O4 .xH2O

Fe2O3.xH2O

FeO.xH2O

Fe3O4

answer is B.

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Detailed Solution

Fe→Fe+2 + 2e- . Fe+2 formed at anodic site on the surface of Iron oxidizes to Fe+3 in presence atmospheric oxygen to form Fe2O3 .xH2O (a red layer)

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