Answer:
Under the condition of electrolysis of
aqueous sodium chloride, oxidation of water at anode requires over potential.
So, Cl- is oxidized at anode instead of water.
Possible oxidation half cell reactions
occurring at anode are
Species having lower cell undergo oxidation
first than the higher value but oxidation of H2O to O2 is
kinetically so slow that it needs some overvoltage.
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