Question

Which one of the following set of metals deposits an anode mud during the process of electrolytic refining of copper?

• A. $Sn$ and $Ag$
• B. $Pb$ and $Zn$
• C. $Ag$ and $Au$
• D. $Fe$ and $Ni$

Answer 1

Answer: (C)

$Ag$ and $Au$

Answer 2

During electrolytic refining of copper, impurities of silver $(Ag)$, gold $(Au)$, platinum $(Pt)$, selenium $(Se$ being less electropositive are not affected by electrolytic solution of acidified copper sulphate. Thus, these settle down under the anode as anode mud or anode sludge