I don't understand this question in my chemistry book. It's not homework, I'm just studying, but I would really like to know. What are the coefficients in front of nitrate ion and zinc when the following equation is balanced in a basic solution: ___ NO3-(aq) + ___ Zn(s) --> ___ Zn2+(aq) + ___ NO(g)? 1) 2, 5 2) 2, 3 3) 3, 4 4) 3, 2 That's the nitrate ion, zinc, zinc with a 2+ charge, and NO. Can someone explain how to do this? Also, what is the answer, so I can work backwards? So far, it looks to me like both reactants are being oxidised, so I'm left with a big half-reaction with electrons.