JEE Advance - Chemistry (2015 - Paper 1 Offline - No. 2)
Copper is purified by electrolytic refining of blister copper. The correct statement(s) about this process
is(are)
Impure Cu strip is used as cathode
Acidified aqueous CuSO4 is used as electrolyte
Pure Cu deposits at cathode
Impurities settle as anode – mud
Explanation
(a) is wrong statement. Impure copper is set as anode where copper is oxidized to Cu2+ and goes into electrolytic solutions.
(b) CuSO4 is used as an electrolyte in purification process.
(c) Pure copper is deposited at cathode as : Cu2+ + 2e$$-$$ $$\to$$ Cu : (At cathode)
(d) Less active metals like Ag, Au etc. settle down as anode mud.
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