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Question
Give reasons On the basis of E° values, O2 gas should be liberated at anode but it is Cl2 gas which is liberated in the electrolysis of aqueous NaCl.
Solution
The anode is positive in the electrolytic cell and oxidation takes place. Therefore, at anode H2O, OH-, Cl- gets attracted (negative charge gets attracted to positive charge) but OH- cannot oxidise because hydrogen is in maximum oxidation state and to oxidise H20, we need more electricity (overpotential) because of presence of hydrogen bond so, Cl- gets oxidised to produce Cl2 gas
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