When copper is purified by electrorefining process, noble metals like Ag and Au are found in :

cathode mud

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over anode

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anode mud

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over cathode or anode

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Solution

The correct option is D anode mud
In electrorefining step, impurities like Fe, Ni, Zn get dissolved in the solution while Au, Ag and Pt are deposited as anode mud below the anode.

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