Question

In electro-refining of copper, some gold is deposited as:

• A. cathode mud
• B. electrolyte
• C. anode mud
• D. none of these

Answer 1

The correct option is C anode mud

• 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 the 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.