What is the oxidation number of manganese in KMnO4?

(1) +7

(2) +2

(3) +3

(4) +4

Answer and Explanation:

We can figure out the oxidation number of Manganese by making a simple equation. First, we need to see what are the oxidation numbers of all of the other elements. We can find these numbers on the periodic table. We can see that K has +1 number while oxygen is -2. Therefore, we can now make our equation.

All the oxidation numbers must add up to 0, since the molecule is neutral.

Thus our equation is +1 + x+ (-2)(4) = 0

Therefore, x=+7, choice 1 is correct