If we want to pure a impure copper plate then it should be attached in place of electrode connected to negative terminal or positive terminal when the electrodes are immersed in CuSo4 solution?

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Solution

Copper ion is positively charged. It is attracted towards the plate which is connected to the negative terminal of the battery. As copper ions are transferred to the thin copper plate, this thin pure copper plate must be connected to the negative terminal of the battery. Consequently, impure copper rod is connected to the positive terminal of the battery.

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