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  4. In chromite ore, the oxidation number of iron and chromium are respectively.

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Q. In chromite ore, the oxidation number of iron and chromium are respectively.

NTA AbhyasNTA Abhyas 2022

Solution:

Actual composition of chromite ore $\left(\right.FeCr_{2}O_{4}\left.\right)$ is FeO. $C r_{2}O_{3}$ . In FeO, the oxidation state of Fe is +2 while in $C r_{2}O_{3}$ , the oxidation state of Cr is +3.