The oxidation number of Fe in ${\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6\right]}^{3-}$ ion is

Given data : It is given to identify  oxidation number of Fe in ${\displaystyle {\left[Fe{\left(CN\right)}_6\right]}^{3-}}$ ion .

Explanation

oxidation state of  k = +3

oxidation state of CN would be = -1

let's find an oxidation state of Fe by y

$$\begin{gathered} 3\times 1+1\times \mathrm{y}+6(-1) \\ 3+\mathrm{y} -6 =0 \\ \mathrm{y}=6-3 \\ \mathrm{y}=+3 \end{gathered}$$

Hence , the correct answer is( C) .+3