See image — AITS & Test Series Chemistry Question

💡 Solution & Explanation

At cathode: 2 2 2H O 2e H 2OH    At anode: 2 2Cl Cl 2e   Among the given electrolytes only sodium is present above hydrogen in the activity series. Hence aqueous NaCl should be electrolysed. Other metals like Cu, Hg and Au are present below hydrogen in the activity series.