During the electrolysis of copper II sulphate between platinum electrodes, if litmus solution is added to the anode compartment,
Cu\(^+\) is discharged preferentially at the cathode
OH\(^-\) is discharged preferentially at the anode
The presence of SO\(_4\)\(^2-\) and H\(^+\) makes the medium acidic
Which makes the litmus turns red and oxygen is evolved
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