When 10^–6 M – HCl is electrolysed — Electrochemistry Chemistry Question

💡 Solution & Explanation

In a highly dilute solution of HCl (10^-6 M), the concentration of Cl^- is extremely low. At the anode, the oxidation of water to produce O2 gas requires a lower overpotential and is far more favorable than the oxidation of traces of Cl^- to Cl2. Therefore, oxygen gas is produced at the anode. Therefore, correct answer is A.