1. Dihydrogen Phosphate   PO3   SCN   BrO3   H2PO4   Hint Half-n-half Clue   2. Cyanate   CNO   CrO4   HPO4   H2PO4   Half-n-half Clue   3. Bromite   PO3   C2O4   ClO   BrO2   Half-n-half Clue   4. Phosphite   PO3   BrO4   S2O3   C2H3O2   Half-n-half Clue   5. Perchlorate   BrO   ClO4   CrO4   MnO4   Half-n-half Clue   6. Acetate   C2H3O2   CrO4   CNO   ClO3   Half-n-half Clue   7. Dichromate (Cr2O7)   IO4   BrO4   Cr2O7   PO3   Half-n-half Clue