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There are several rules to find the oxidation state of an element present in a compound or ion. Some of them are given below.
NaO2( Sodium peroxide); Na= +1 (Rule 3) using (Rule 6) = +2 + 2X = 0, X= -1
BaO2( Barium peroxide); Ba= +2 (Rule 3) using (Rule 6) = +2 + 2X=0, X= -1
CsO2( Caesium superoxide); Cs= +1( Rule 3) using (Rule 6) = +1 + 2X=0, X= -1/2
8. Certain p-block elements and d-block and f-block elements can show varied oxidation states in different compounds.Ex: p-block elements= Sulphur can show oxidation states -2, -1, +4, +6 ( Na2S, Na2S2, SO2, H2SO4)
d-block elements= Manganese= +2,+4,+7 ( MnSO4, MnO2, KMnO4) Iron = +2, +3 ( FeCl2, FeCl3)
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