Question

Find the oxidation number of Mn in KMnO4.​

Answer 1

oxidation number

k=1
O=-2
O4=-8

Mn=x

KMnO4

1+x-8=0

x=7

Answer 2

let the oxidation no of Mn is = X

in KMnO4, k and O have oxidation no +1,-2 respectively and KMnO4 is a stable and uncharged compound, so it's oxidation no will be 0,

so,

+1 + X +(-2)8=0

X-7 = 0

X= +7

Hope this helps you