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In chromite ore, the oxidation number of iron and chromium are respectively
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$+2,+3$
Chromite ore is $\mathrm{FeCr}_{2} \mathrm{O}_{4}$, ie, $\mathrm{FeO}, \mathrm{Cr}_{2} \mathrm{O}_{3}$ O.N. of $\mathrm{Fe}=+2 ; \quad$ O.N. of $\mathrm{Cr}=+3$.
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