AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
(B) Impure copper block
In electrolytic refining of copper, the impure copper block is used as the anode, pure copper strip as the cathode, and acidified copper sulphate solution as the electrolyte.
Source: Chapter 3, Section 3.4.6 (Refining of Metals)
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The textbook clearly states: "the impure metal is made the anode and a thin strip of pure metal is made the cathode." Examiners expect you to know all three components (anode, cathode, electrolyte) for this topic, even if the question asks only about one. Option (A) is the cathode, (C) is the electrolyte, and (D) is never used here.