Question

Which one of the following figures correctly describes the process of electrolytic refining?

Options

•  

•  

•  

• 

Answer 1

In the process of electrolytic refining of copper, the impure copper metal is made the anode and connected to positive terminal of the battery. A thin strip of pure copper metal is made the cathode and connected to negative terminal of the battery. A solution of the metal salt (CuSO₄) is used as an electrolyte. On passing the current through the electrolyte, the pure metal from the anode dissolves into the electrolyte as Cu²⁺. An equivalent amount of pure metal from the electrolyte is deposited on the cathode. The soluble impurities go into the solution, whereas, the insoluble impurities settle down at the bottom of the anode and are known as anode mud.