Complete the cell reaction on the positive electrode for the nickel-cadmium battery.
\(2NiOOH + 2{H_2}O + 2{e^ - }^{\begin{array}{*{20}{c}} {{\rm{Discharge}}}\\ {\begin{array}{*{20}{c}} \to \\ \leftarrow \\ {{\rm{Charge}}} \end{array}} \end{array}}\)1
2Ni(OH)2 + (H2O̅)
2
3Ni2SO4 + 2HCl
3
Ni2HO2 + 2H2O
4
2Ni(OH)2 + 2(OH̅)