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  4. The oxidation number of iron in Fe3O4 is

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Q. The oxidation number of iron in $ Fe_{3}O_{4}$ is

ManipalManipal 2011Redox Reactions

Solution:

In $Fe _{3} O _{4}$, let oxidation number of $Fe =x$
$3 x+4(-2)=0$ or $x=\frac{8}{3}$