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