During the electrolysis of an aqueous solution of , which of the following accurately describes the — Electrochemistry Chemistry Question

💡 Solution & Explanation

In aqueous $NaCl$, both $Cl^-$ and $OH^-$ migrate to the anode. In very dilute solutions, $OH^-$ is preferentially oxidized to form $O_2$ gas because its standard discharge potential is lower. However, in concentrated solutions (brine), $Cl_2$ gas is preferentially evolved instead of $O_2$ due to the high overvoltage (overpotential) required for oxygen kinetics.