Question

Question #ee902

Answer 1

Mn O.N =+7

Explanation:

We all know oxygen has an oxidation number = 2
So when we have a charge on the molecule.
It means the sum of all the oxidation number of the molecule should add up to give that charge.
Like the ex. You have asked `MnO_4^-`
The molecule has -1 as the charge.
So,
(O.N of Mn + O.N of Oxygen should equal to -1)
We all know oxidation number(O.N) of O is -2
So,
Let X be the O.N of Men
`X+(-2**4)=-1`
I.e. `X-8=-1`
Or X=-1+8
I.e. X=+7

Hope you understand. :)