Question

The oxidation number of iron in potassium ferricyanide $\left[K_{3}Fe\right(CN{)}_6]$ is :

• A. Two
• B. Six
• C. Three
• D. None

Answer 1

The correct option is C Three

To calculate: Oxidation state of iron in potassium ferro cyanide.

Solution :

Oxidation state of Potassium , K = +1

Oxidation state of Cyanide ion =-1

Let oxidation state of Iron be x

We know that sum of all the oxidation states in the compound is equal to overall charge of the compound.

Therefore, (+1)3 +[ x +6(-1)] = 0

$\Rightarrow 3+[x-6]=0$

$\Rightarrow x=+6-3=+3$

Hence, the correct option is C.