Oxidation number of elements in atoms and ions Quiz What is the oxidation number of ‘O’ in H2O2 +2 -1 -2 +1 Determine the oxidation number of Nitrogen ‘N’ in the compound HNO3 +5 +3 -3 +1 -5 The oxidation number of Cr in Cr2O72- -3 -6 +12 +6 +3 Determine the oxidation number of ‘Cl’ in ClO4– -5 -3 +5 -1 +7 -7 Determine the oxidation number of ‘N’ in NH4+ +4 -3 +1 +3 The oxidation number of ‘O’ in OF2 is -1 +1 +2 -2 Loading … Question 1 of 6 Share this:TweetWhatsAppLike this:Like Loading...