Question

Calculate the oxidation number of $Fe$ in $K_4\left[Fe\right(CN{)}_6]$.

Answer 1

$K_4\left[Fe\right(CN{)}_6]$ $k^{+}=+1$
$(+1\times 4)+x+(-1\times 6)=0$ $C{N}^{-}=-1$
$+4+x-6=0$
$x=+2$