1(xiii)
Aqueous copper (II) sulphate is electrolysed using copper electrodes. Which statement about the electrolysis is not correct?
- (a)An oxidation reaction occurs at the positive electrode.
- (b)The current is carried through the electrolyte by ions.
- (c)The positive electrode loses mass.
- (d)The number of copper (II) ions in the electrolyte decreases.
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The number of copper (II) ions in the electrolyte decreases.
Reason — Cu2+ ions deposited at the cathode are replaced by Cu2+ ions produced at the anode, so the overall Cu2+ concentration stays constant.