A lead-acid automotive battery consists of voltaic cells in series. The cathode of each cell consists of lead(IV) oxide (PbO2) packed in a metal grid. The anode of each cell is composed of lead. Both electrodes are immersed in sulfuric acid. Write the net ionic equation for the cell reaction:
a) PbO2(s) + Pb(s) + 2H2SO4(aq) -> 2PbSO4(s) + 2H2O(l)
b) PbO2(s) + Pb(s) + 2H+(aq) + 2SO4²-(aq) -> 2PbSO4(s) + 2H2O(l)
c) Pb(s) + 2H2SO4(aq) -> PbSO4(s) + SO2(g) + 2H2O(l)
d) 2PbO2(s) + 2Pb(s) + 4H+(aq) + 4SO4²-(aq) -> 6PbSO4(s) + 2H2O(l)
