`100mL` of buffer of `1 M NH_(3)(aq)` and `1 M NH_(4)^(o+)(aq)` are placed in two compartments of a voltaic cell separately. A current of `1.5A` is passed through both cells for `20 m i n`. If only electrolysis of water takes place, then

Options

A. half-cell on L.H.S. will increase
B. half-cell on R.H.S. will increase
C. Both the half-cells will increase
D. Both the half-cells will decrease

Answer

B

Explanation

Since `OH^(-)` is produced in L.H.E., hence the pH of R.H.E. increases, whereas `H^(+)` is produced in the L.H.E. hence the pH of L.H.E. decreases.