Question

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

• A. +3, +2
• B. +3, +6
• C. +2, +6
• D. +2, +3

Answer 1

Answer: (D)

+2, +3

Answer 2

Chromite ore is $FeCr _{2} O _{4}$, ie, $FeO.Cr _{2} O _{3}$

O.N. of $Fe =+2$; O.N. of $Cr =+3$