Oxidation Numbers in Potassium Permanganate

What is the oxidation number of oxygen in most compounds?

• +2

• -2

• -1

• +1

Why is it difficult to find the oxidation numbers for K and Mn using the sum of oxidation numbers rule?

• Because there are two unknowns and only one equation

• Because the compound is too complex

• Because the rules do not apply to KMnO4

• Because the oxidation numbers are not integers

What is the charge of the permanganate ion (MnO4-)?

• -1

• +2

• +1

• -2

How do you determine the oxidation number of Mn in MnO4-?

• By using the sum of oxidation numbers for a polyatomic ion

• By using the atomic number of Mn

• By using the molecular weight of MnO4-

• By using the color of the compound

What is the oxidation number of Mn in KMnO4?

• +5

• +3

• +7

• +4