Question

During the process of electrorefining of $Cu$, 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

The correct option is C $Ag$ and $Au$

When an electric current is passed through the electrolyte, the anode gradually dissolves and pure copper is deposited on the cathode which gradually grows in size. The impurities like $Fe,Zn,Ni$, etc, dissolve in the solution as sulphates while gold, silver, platinum settle down below the anode as anode mud.