Chemistry
JAMB 1978
During the electrolysis of copper II sulphate between platinum electrodes, if litmus solution is added to the anode compartment,
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A.
the litmus turns blue but no gas is evolved
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B.
the litmus turns blue and oxygen is evolved
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C.
the litmus turns blue and hydrogen is evolved
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D.
the litmus turns red and oxygen is evolved
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E.
the litmus turns red and then becomes colourless
Correct Answer: Option D
Explanation
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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