Two aqueous solutions A and B containing solute `CuSO_(4)` and `NaBr` respectively were electrolysed using platinum electrodes. The `pH` of the resultins will show `a//an :`

Options

A. Increase in both the solutions
B. Decrease in both the solutions
C. Increases in A and decrease in B
D. Decrease in A and increase in B

Answer

4

Explanation

In solution A `:`
`Cu^(2+)+2e^(-)rarr Cu,2H_(2)Orarr O_(2)+4H^(+)+4e^(-)(pH` decrease `)`
In solution B `:`
`2Br^(-)rarr Br_(2)+2e^(-),2H_(2)O+2e^(-)rarr H_(2)+2OH^(-)(pH` increases `)`