Question

The oxidizing state of Mn in KMnO4?

Answer 1

as 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 kMnO4 is 7.

Answer 2

Let oxidation state of Mn be x
So
1 + x + 4×(-2) = 0
1 +x -8=0
x = 7
Hope its helpful