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Oxygen is produced at the anode in the electrolysis of aqueous sodium sulfate.
Anions in electrolytes are discharged at the cathode.
The higher the concentration of ions in an electrolyte, the easier it is for the ions to be reduced at the electrode.
Metals such as gold and platinum do not require special methods to be extracted because they exist as free metals.
Iron can be extracted from its ore by reduction with carbon.
Zinc is more electropositive than iron.
Carbon is used as a reducing agent in the extraction of metals from their ores.
Aluminum oxide, Al₂O₃, is extracted by the electrolysis process using carbon electrodes.
The main use of copper in the industry is due to its good electrical conductivity.
Less reactive metals like copper can be extracted by roasting the metal ore in air.