Copper is purified by electrolytic refining of blister copper. The incorrect statement about this process is:

Pure Cu deposits at cathode

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Impure Cu is used as cathode

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Acidified aqueous $C u S O_{4}$ is used as electrolyte

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Impurities settle as anode mud

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Solution

The correct option is B
Impure Cu is used as cathode

Think about what goes on in the electrolytic refining process. We want the impure metal to get oxidized and go into the solution as an ion and then get reduced at the other electrode. In cells (both Daniel and electrolytic) anode $⟹$ oxidation and cathode $⟹$ reduction.

Hence, impure metal (blister copper) is used as the anode. Some precious metals like gold, silver and platinum get deposited below the anode as 'anode mud.'

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