A) cathode
B) electrode
C) cathode mud
D) anode mud
Correct Answer: D
Solution :
Blister copper obtained from the Bessemer convenor is purified first by poling to get 99.5% pure copper and then the electrolytic refining to get copper of very high purity (99.95%-99.99%). Impure copper usually contains Ag, Au, Ni, Zn, Fe, Pb, Sn etc., as impurity. Impure metal is taken as anode dipped in the acidified solution of \[CuS{{O}_{4}}.\]The impurities of Ni, Fe and Zn pass into solution as sulphate while impurities of Ag, Au and Sn etc. are thrown down as anode mud (below anode).
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