Q18Assertion & reason
Value of standard electrode potential for the oxidation of Cl ion is more positive than that of water, even then in the electrolysis of aqueous sodium chloride – solution, why is Cl oxidised at anode instead of water? (3)
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Under the conditions of electrolysis of aqueous sodium chloride, oxidation – of water at anode requires overpotential hence Cl is oxidised instead of water. Distribution of marks • Explanation (2 marks) • Reaction (1 mark)