determind the oxidation number of the underlined element in each of the following:?

O2 (oxygen underlined) ClO3- (chlorine underlined) Na2S2O3 (sulphur under)

AgNO3 (silver underlined) CO3 2- (Carbon underlined)

MnO2 (maganese underlined) KMnO4 (maganese underlined)

ZnSO4 (zinc underlined) MgSO3 (Sulphur underlined)
 
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