Question

Oxidation state of iron and chromium in chromite ore is:

• A. 2, 3
• B. 3, 2
• C. 2, 2
• D. 3,3

Answer 1

Answer: (A)

Chromite ore is $FeC{r}_2{O}_4$ containing $F{e}^{+2}$ and $C{r}^{+3}$

${\text{FeCr}}_{\text{2}}{\text{O}}_{\text{4}}=\text{FeO}\cdot {\text{Cr}}_{\text{2}}{\text{O}}_{\text{3}}$