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During the purification of copper by electrolysis:

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During the purification of copper by electrolysis:
A. the anode used is made of copper ore
B. pure copper is deposited on the cathode
C. the impurities such as Ag, Au present in solution as ions
D. concentration of `CuSO_4` solution remains constant during dissolution of Cu
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Correct Answer - A::B::D
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