In KMnO4, the oxidation state of manganese Mn can be determined by considering the oxidation states of the other elements in the compound and the overall charge of the compound.Potassium K has an oxidation state of +1, and oxygen O typically has an oxidation state of -2.The compound KMnO4 is neutral, so the sum of the oxidation states of all the elements in the compound should equal zero.Let x be the oxidation state of manganese Mn . Then, the equation for the sum of the oxidation states is: +1 + x + 4 -2 = 0Solving for x:x - 7 = 0x = +7So, the oxidation state of manganese Mn in KMnO4 is +7.