1. Hypochlorite   ClO   C2O4   BrO2   O2   Hint Half-n-half Clue   2. Peroxide (O2)   ClO2   ClO   O2   BrO   Half-n-half Clue   3. Hypobromite   ClO4   BrO   ClO3   MnO4   Half-n-half Clue   4. Oxalate   CN   IO2   C2O4   Cr2O7   Half-n-half Clue   5. Chlorate   Cr2O7   ClO3   BrO   CrO4   Half-n-half Clue   6. Hypoiodite   HPO4   IO   BrO3   C2H3O2   Half-n-half Clue   7. Nitrite   ClO4   NO2   IO   MnO4   Half-n-half Clue