Assign oxyidation number of all the elements in the compound KMnO4

Answer 1

In KMnO4:

Potassium (K) has an oxidation number of +1

Manganese (Mn) has an oxidation number of +7

Oxygen (O) has an oxidation number of -2

Therefore, the oxidation numbers for all elements in KMnO4 are:

K: +1
Mn: +7
O: -2