Electrolysis is the process of decomposition of an electrolyte (in molten or in aqueous state) by passing electric current. It results in discharge of ions of electrolyte at the electrodes. The electrodes (anode and cathode) are two conducting rods immersed in electrolyte through which current enters and leaves the electrolytic cell. There are various applications of electrolysis such as electroplating of metals, electrorefining of metals, electrometallurgy. Electroplating is an electrolytic process by which a thin film of a non-reactive and superior metal is deposited on an article made of more reactive and inferior metal. The non-reactive and superior metals commonly used for electroplating include gold (Au), silver (Ag), nickel (Ni), chromium (Cr) etc. In electrorefining, metals containing impurities are purified electrolytically to give pure metal. This method is used for the refining of metal like copper, silver, gold, zinc, aluminium, etc. The process of extraction of metals from its ores by electrolysis is called electrometallurgy. The highly electropositive metals like potassium (K), sodium (Na), calcium (Ca), magnesium (Mg), aluminium (Al) etc. are extracted by electrolysis.

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