Question

Anode mud obtained after electrolytic refining of copper contains:

• A. $Ag$
• B. $Au$
• C. $Pt$
• D. All of the above

Answer 1

The correct option is D All of the above

Electrorefining:

Anode: Impure copper or crude copper

Cathode: Pure copper

Electrolyte: 15% $CuS{O}_4$ Solution + 5% $H_{2}S{O}_4$

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