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| 1. |
What are the various methods used for the refining of metals |
| Answer» The most widely used method for refining impure metals is electrolytic refining. Electrolytic refining means refining by electrolysis. Metals such as copper, zinc, tin, lead, chromium, nickel, silver and gold are refined electrolytically.\xa0\tFor refining an impure metal by electrolysis: A thick block of impure metal is made the anode. A thin strip of pure metal is taken as the cathode. A water soluble salt is taken as the electrolyte. On passing current through the electrolyte, the impure metal from the anode dissolves into the electrolyte. 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 the ‘anode mud’. | |