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

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By Expert Faculty of Sri Chaitanya
a
Fe3O4 .xH2O
b
Fe2O3.xH2O
c
FeO.xH2O
d
Fe3O4
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detailed solution

Correct option is B

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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