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