Question

Calculate the oxidation number of MNO
4 -

Answer 1

Oxygen is mostly negative besides linking with F (fluor).

Oxygen is mostly in -2 oxidation states besides peroxide, superoxides.

Alkaline and alkaline-earth metals are respectively in +1 and +2 ox. states.

Normal molecule must be in 0 ox. state

K Mn O4 - oxidation state of Mn is “x”. So,

(+1) + (x) + (2*(-4)) = 0

x = 7

hope it clarifies ur doubt dear friend..

Answer 2

As oxygen will have a -2 charge and there are four of them, so collectively they are -8. The anion has a -1 overall charge after the Mn is put in, so Mn must have a +7.