Question

During the process of electrolyte 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

The correct option is C Ag and Au

• In Electrolytic refining, the impure metal is made to act as an anode. A strip of the same metal in pure form is used as a cathode.
  
• They are put in a suitable electrolytic bath containing a soluble salt of the same metal.
• The more basic metal remains in the solution and the less basic ones go to the anode mud.
• Copper is refined using an electrolytic method.
  
• Impurities from the blister copper deposit as anode mud which contains antimony, selenium, tellurium, silver, gold, and platinum; recovery of these elements may meet the cost of refining.