Which of these oxidation states is correct?
Oxygen in H2O2\text{H}_2\text{O}_2H2O2 is −2-2−2
Nitrogen in N2\text{N}_2N2 is −3-3−3
Hydrogen in LiH\text{LiH}LiH is −1-1−1
Manganese in KMnO4\text{KMnO}_4KMnO4 is +6+6+6