1. Cyanide   CN   S2O3   ClO   CrO4   Hint Half-n-half Clue   2. Iodate   IO3   C2O4   BrO4   BrO3   Half-n-half Clue   3. Hypochlorite   S2O3   BrO3   O2   ClO   Half-n-half Clue   4. Permanganate   IO2   C2O4   ClO3   MnO4   Half-n-half Clue   5. Nitrite   ClO2   C2O4   IO   NO2   Half-n-half Clue   6. Acetate   C2H3O2   CNO   SCN   HPO4   Half-n-half Clue   7. Dichromate (Cr2O7)   BrO2   C2H3O2   S2O3   Cr2O7   Half-n-half Clue