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1. The oxidation number of sulfur in SO₄^2- is

-4.
+4.
-6.
+6.

2. The oxidation number of iodine in IO₃^- is

+1.
+3.
+5.
+6.

3. The oxidation number of carbon in CH₄ is

-2.
+2.
-4.
+4.

4. The oxidation number of carbon in CO is

-2.
+2.
-4.
+4.

5. The oxidation number of phosphorus in P₄O₆

+1.
-1.
+3.
-3.