oxidized rusting magnesium anode sacrificed intervals new ingots buried replace lost electrolysis spontaneous redox reactions conventional battery produce electricity different chemical potentials cathode anode electrolyte however electrolysis requires external source electrical energy induce chemical reaction process takes place compartment called electrolytic cell electrolysis molten sodium chloride molten salt sodium chloride electrolyzed yield metallic sodium gaseous chlorine industrially process takes place special cell named 's
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