40. During the spontaneous discharging operation of a standard commercial dry cell (Leclanché cell), — Electrochemistry Chemistry Question

💡 Solution & Explanation

In a dry cell, $MnO_2$ acts as the depolarizer. It oxidizes the hydrogen gas produced at the cathode to water, while manganese is reduced from the +4 oxidation state in $MnO_2$ to the +3 state in $MnO(OH)$.