During the electrolysis of copper II sulphate betw..

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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
B. the litmus turns blue and oxygen is evolved
C. the litmus turns blue and hydrogen is evolved
D. the litmus turns red and oxygen is evolved
E. the litmus turns red and then becomes colourless

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