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  4. Oxidation state of iron and chromium in chromite ore is:

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Q. Oxidation state of iron and chromium in chromite ore is:

NTA AbhyasNTA Abhyas 2020General Principles and Processes of Isolation of Elements

Solution:

Chromite ore is $FeCr_{2}O_{4}$ containing $Fe^{+ 2}$ and $Cr^{+ 3}$

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