During the process of electrorefining of copper some metals present as impurity settle as anode mud. These are
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a
Sn and Ag
b
Pb and Zn
c
Ag and Au
d
Fe and Ni
answer is C.
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Detailed Solution
More electropositive metals associated with Cu (Fe, Zn, Co, Ni) pass in solution state and less electropositive metals (Au, Ag) collect below the anode as anode mud.