A) +3,+2
B) +3,+6
C) +2, + 6
D) +2, + 3
Correct Answer: D
Solution :
Chromite or chrome iron ore is \[FeC{{r}_{2}}{{O}_{4}}\]. Its actual composition is \[FeO\,\,.\,C{{r}_{2}}{{O}_{3}}\]. In \[FeO\], oxidation state of Fe is calculated as \[x+(-2)=0\] \[x=+2\] Similarly, in \[C{{r}_{2}}{{O}_{3}}\], the oxidation state of Cr is calculated as \[2\times x+(-2)\times 3=0\] \[2x=+6\] \[x=+3\]
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