During  electrolysis of  ${\mathrm{CuSO}}_{4\left(\mathrm{aq}\right)}$ the pH of solution becomes

During electrolysis of ${\mathrm{CuSO}}_{4\left(\mathrm{aq}\right)}$  solution, the  resulting solution is acidic $\left({\mathrm{H}}_2{\mathrm{SO}}_4\right)$
Hence $\mathrm{pH}<7$