<Dd> Fe → Fe + 2 e </Dd> <P> The following redox reaction also occurs in the presence of water and is crucial to the formation of rust: </P> <Dl> <Dd> 4 Fe + O → 4 Fe + 2 O </Dd> </Dl> <Dd> 4 Fe + O → 4 Fe + 2 O </Dd>

Why does rust form on some metallic materials