Question
Class 11ChemistryRedox Reactions

What is the oxidation number of metals in:

(i) [Fe(CN)6]4−

(ii) MnO4−

Verified Answer

(i) Fe in [Fe(CN)6]4−
      Let the oxidation number of Fe = x.
      x + 6(−1) = −4 ⟶ x − 6 = −4 ⟶ x = +2
      Thus, the oxidation number of Fe in [Fe(CN)6]4− is +2.

(ii) Mn in MnO4−
       Let the oxidation number of Mn = x.
       x + 4(−2) = −1 ⟶ x − 8 = −1 ⟶ x = +7
       Thus, the oxidation number of Mn in MnO4− is +7.