Q.

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.
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