Oxidation States

In compounds, the elements of groups 1 and 2 as well as aluminum have oxidation numbers of

________________ respectively

• +1, -2, and +3

• -1, +2, and -3

• +1, +2, and +3

• +1, +3, and +4

Oxygen has an oxidation number of -2 unless it is combined with F (when it is ______), or it is in a peroxide (such as H₂O₂ or Na₂O₂), when it is -1

• +2

• +1

• -1

• -2

The sum of the oxidation numbers of all atoms in a polyatomic ion equals the (a)   of the ion

The oxidation number of a monatomic ion equals the (a)   on the ion

The oxidation number of fluorine in a compound is always ___

• +1

• +2

• -2

• -1

The oxidation number of any uncombined element is ___

• 0

• +1

• -1

• +2

The oxidation state of hydrogen in most of its compounds is +1 unless it is combined with a metal, in which case it is (a)  

What is the oxidation state of each element in the following molecule: H₂SO₄

• H:1+ S:4+ O:2-

• H:1+ S:6+ O:1-

• H:1+ S:6+ O:2-

• H:1+ S:5+ O:2-

What is the oxidation state of each element in the following molecule: K₃PO₄

• K:1+ P:4+ O:2-

• K:1+ P:5+ O:2+

• K:2+ P:5+ O:2-

• K:1+ P:5+ O:2-

What is the oxidation state of each element in the following anion: PO₄^3-

• P:4+ O:2-

• P:5+ O:2-

• P:5+ O:2+

• P:5+ O:1-