In the compound KMnO4, the oxidation state of manganese can be determined by considering the oxidation states of the other elements in the compound. Potassium K has an oxidation state of +1, and oxygen O typically has an oxidation state of -2.The overall charge of the compound is neutral, so the sum of the oxidation states of all the elements in the compound must 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 in KMnO4 is +7.