Discussion Forum



1)

 Copper is purified by electrolytic refining of blister copper. The correct statement(s0 about this process is/are 


A) impure Cu strip is used as cathode

B) acidified aqueous $CuSO_{4}$ is used as elecrolyte

C) pure Cu deposits at cathode

D) impurities settle as anode -mud

Answer:

Option B,C,D

Explanation:

(a) is wrong statement, Impure copper is set as anode where copper is oxidised to Cu2+ and goes into electrolyte solutions.

(b) CuSO4 is used as an electrolyte in the purification process

(c)  Pure copper is deposited at cathode as :

    $Cu^{2+}+2\overline{e}\rightarrow Cu $   :  (At  cathode )

 (d) Less active metals like Ag, Au etc. settle down as anode mud.