Chemistry - Electrochemistry Question with Solution | TestHub

100 ml of a buffer of $1\mathrm{M}-{\mathrm{NH}}_3$ and $1\mathrm{M}-{\mathrm{NH}}_4{}^{+}$is placed in a voltaic cell. A current of 1.5 amp is passed through the cell for 20 min . If only the electrolysis of water takes place and the electrode reactions are:

Right : $2{\mathrm{H}}_2\mathrm{O}+{\mathrm{O}}_2+4\mathrm{e}\to 4{\mathrm{OH}}^{-}$

Left : $2{\mathrm{H}}_2\mathrm{O}\to 4{\mathrm{H}}^{+}+{\mathrm{O}}_2+4\mathrm{e}$,

Then the pH of the :