In the electro refining of copper, some gold is deposited as

anode mud

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cathode mud

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cathode

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electrolyte

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Solution

The correct option is A anode mud
Explanation :

In electrolytic refining of copper some gold is deposited below anode. Impure copper usually contains impurities such as Ag, Au, Ni,Zn, Fe,Pb and Sn.

Impure metal is taken as anode and dipped in the acidified solution of copper sulphate.

The impurities of Ni, Fe and Zn pass into solution as sulphate while impurity of Ag, Au and Sn etc. are thrown down as anode mud below anode.

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