What is the common method for refining impure metals, and which process is widely used for refining metals such as copper, zinc, tin, nickel, silver, and gold?

The common method for refining impure metals is electrolytic refining. This widely used process is particularly employed for refining metals such as copper, zinc, tin, nickel, silver, and gold. In electrolytic refining, the impure metal is used as the anode, and a pure metal or metal rod serves as the cathode. An electrolyte containing metal ions facilitates the migration of ions from the anode to the cathode. The impurities are either left in the electrolyte or form compounds, while the pure metal is deposited at the cathode. This process allows for the production of high-purity metals with a wide range of applications.