How to find oxidation numbers

Which of these are neutral compounds?

• MnO4 2-

• O2

• CaCl2

• NH4 +

• CO2

What is the oxidation number for C in the compound CO2 if we know that oxygen has an oxidation number of -2?

• +2

• -2

• +4

• -4

• 0

What is the oxidation number of oxygen in CO2?

• +2

• -2

• 0

• +4

• -4

What is the oxidation number of carbon in CO2?

• -4

• +4

• -2

• +2

• 0

What is the oxidation number for oxygen in SO4 2-?

• -2

• +2

• 0

What is the oxidation number of S in SO4 2-?

• +6

• -6

• +8

• -8

• -2

Oxidation numbers and ionic charges are the same thing.

• true

• false

For a single ion, the oxidation number is equal to it's

For monoatomic elements, the oxidation number is

What is the charge of fluorine in OF2?

• -1

• -2

• +1

• +2