Cr2O7 2- re: Cr is +6 because total charge -2, oxygen -2 each. S4O6 2- is tricky, yaar, two S are +5 and two are 0, average comes +2.5. CH3COOH? Carbon in methyl is -3, in carboxyl is +3. You see, balancing charges is like fixing a fan motor—you trace each wire, find where the current is stuck. My neighbour's boy failed this same question, but when I drew it like a circuit diagram, his face lit up just like when the fan starts whirring again.
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