find oxidation no of Fe in Fe4[Fe(CN)6]3
Oxidation state of Fe in Fe4[Fe(CN)6]3 can be determine as follow :
1. Oxidation state of outer Fe
Fe4[Fe(CN)6]3 being a salt will dissociate as :
Fe4[Fe(CN)6]3 → 4 Fe 3+ + 3 [Fe(CN)6]4-
Hence the oxidation state of outer Fe is 3 +
2. Oxidation State of inner Fe
Let the oxidation number of Fe be X
Here oxidation number on CN = -1
For [Fe(CN)6]4-
X × 6 (-1) = -4
∴ X = +2
Hence the oxidation state/ number of inner Fe is +2