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What is liberated at the cathode ? Explain.

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Copper from impure copper plate (anode) get dissolved in the copper sulphate solution as $C u^{+ 2}$ ions making the anode plate thinner whereas $C u^{+ 2}$ ions, present in the solution, get reduced at the thin pure copper plate (cathode) and deposited as pure copper making it thicker. Hence pure copper is liberated at cathode.

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