Question

During the process of electrolytic refining of copper,some metals present as impurity settle as ‘anode mud’. These are

(a) Sn and Ag 

(b) Pb and Zn

(c) Ag and Au 

(d) Fe and Ni.

Answer 1

(c) : In the electrolytic refining of copper the more electropositive impurities like Fe, Zn, Ni, Co, etc. dissolve in the solution and less electropositive impurities such as Ag, Au and Pt collect below the anode in the form of anodic mud.