Which of the following chemical and physical changes occur simultaneously when a depleted lead stora — Electrochemistry Chemistry Question

💡 Solution & Explanation

Recharging a secondary battery reverses the spontaneous discharge reactions by forcing current backward. The cell becomes electrolytic (Option D). At the anode (now positive), $PbSO_4$ is oxidized to $PbO_2$ (Option A). At the cathode (now negative), $PbSO_4$ is reduced to $Pb$ (Option B). The reaction regenerates $H_2SO_4$ from water, causing the specific gravity to *increase*, making Option C false.