KO2 is rare and is called potassium superoxide. It consists of K+ ion and O^2- ion. In this case, the oxidation number of O would be 1-. If, however, you meant to ask about K2O (potassium oxide), then the oxidation number of O would be 2-
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The oxidation number is + for C and -2 for O.
The most common oxidation state for selenium is -2, but it can also exist in oxidation states of +4 and +6 depending on the compound it is in.
In the reaction, aluminum in Al2(SO4)3 has an oxidation number of +3. Hydrogen in H2 has an oxidation number of 0.
No, the oxidation number of oxygen in ozone (O3) is -2/3, while in oxygen (O2) it is 0. In ozone, one oxygen atom has an oxidation number of -1 and the other two have an oxidation number of 0, resulting in an average oxidation number of -2/3.
+2 for Mg -2 for O