Copper is purified by electrolytic refining of blister copper. The correct statement(s) about this process is (are)
- (A)Impure Cu strip is used as cathode
- (B)Acidified aqueous is used as electrolyte✓ Correct
- (C)Pure Cu deposits at cathode✓ Correct
- (D)Impurities settle as anode-mud✓ Correct
Answer: (B), (C), (D)
Solution
In electrolytic refining of copper:
During electrolysis, copper from the anode dissolves and deposits as pure copper at the cathode. Impurities either dissolve or settle below the anode as anode mud.
(A) Incorrect: Impure Cu is the anode, not cathode.
(B) Correct: Acidified is the electrolyte.
(C) Correct: Pure Cu deposits at the cathode.
(D) Correct: Impurities settle as anode mud.
Correct answers: (B), (C) and (D).
- Anode: Impure copper (blister copper)
- Cathode: Pure copper strip
- Electrolyte: Acidified solution
During electrolysis, copper from the anode dissolves and deposits as pure copper at the cathode. Impurities either dissolve or settle below the anode as anode mud.
(A) Incorrect: Impure Cu is the anode, not cathode.
(B) Correct: Acidified is the electrolyte.
(C) Correct: Pure Cu deposits at the cathode.
(D) Correct: Impurities settle as anode mud.
Correct answers: (B), (C) and (D).
JEE Advanced · 2015 · 24 May 2015 · Paper 1 · One or more correct options