Question

Fill in the blanks.

The oxidation number of manganese in $KMn{O}_4$ is ....................

Answer 1

The oxidation state of potassium is $K^{+}$ so it is 1.

Let's consider the oxidation state of Mn is x.

The oxidation state of each oxygen molecule is 2 thus making it four.The number of oxygen atoms in $KMn{O}_4$ are 4 so ($4\times -2=-8$).

Since the sum of oxidation states should be neutral. So the equation should be as follows.

$1+X+-8=0$

$X=7.$

So the oxidation state of Mn in $KMn{O}_4$ is 7.