Question #f98b4

1 Answer
Oct 6, 2015

+7

Explanation:

The oxidation number for oxygen is always -2 except in hydrogen peroxide it is -1 and OF_2 it is +2.

Having said that, the oxidation number of Mn in MnO_4^_ is +7. It is calculated as follows:
x+4xx(-2)=-1=>x=+7