During the electrolytic refining of copper, pure copper is deposited at the anode.

True

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False

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Solution

For electrolytic refining of copper, we use:
Cathode: A thin plate of pure copper metal.
Anode: A block of impure copper metal.
Electrolyte: Copper sulphate solution acidified with sulphuric acid.
When an electric current is passed through the electrolytic solution, pure copper gets deposited at the cathode and the impurities settle at the bottom of the anode in the form of sludge called anode mud.

Hence, the given statement is false.

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Q. During electrolytic refining of copper.
(a) Pure copper acts as anode.
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(c) Impure copper acts as anode.
(d) Impure copper acts as cathode.

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In the electrolytic refining of Copper (electrolyte is $C u S O_{4}$ solution + dil $H_{2} S O_{4}$ _;Pure Cu cathode and Impure Cu anode), metallic impurities having lower oxidation potential than Cu are deposited as __ sludge.

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