Question

Statement-I: In electro-refining of blister copper precious metal are obtained in anode mud.

Statement-II: Pure copper is obtained by above method.

(1) Both Statement-I & Statement-II are True 

(2) Both Statement-I & Statement-II are False.

(3) Statement-I is True while Statement-II is False.

(4) Statement-I is False while Statement-II is True.

Answer 1

Impure Cu obtained from ores is converted to pure Cu in an electrolyte cell that the impure copper as the anode an pure copper as the cathode. The electrolyte is an aqueous solution of CuSO₄. At the impure Cu anode, Cu is oxidized along with the more easily oxidized metallic impurities such as Zn and Fe. The less easily oxidized impurities such as Ag, Au, and Pt fall to the bottom of the cell as anode mud, which is reprocessed to recover the precious metals. At the pure Cu cathode, Cu²⁺ ions get reduced to pure copper metal

Thus, the net cell reaction simply involves transfer of Cu metal from the impure anode to the pure cathode, Cu obtained by this process is 99.95% pure.