Question

Calculate the oxidation number of the metal in following

(i) $K_4\left[Fe{\left(CN\right)}_6\right]$

(ii) $KAg{\left(CN\right)}_2$

Answer 1

(i) $K_4\left[Fe{\left(CN\right)}_6\right]\to {4K}^{+}{\left[{Fe\left(CN\right)}_6\right]}^{4-}$

Le the oxidation number of $Fe$ be $x$

$\therefore x+6\times (-1)=-4$

$\therefore x-6=-4$

$\therefore x=+2$

(ii) $KAg{\left(CN\right)}_2\to K^{+}{\left[Ag{\left(CN\right)}_2\right]}^{-}$

Let the oxidation number of $Ag$ be $y$

$\therefore y+z\times (-1)=-1$

$\therefore y=-1+2$

$\therefore y=+1$