Question

What happens when lead storage battery is discharged?

• A. ${SO}_2$ is evolved
• B. Lead sulphate is consumed
• C. $H_2{SO}_4$ is consumed
• D. Lead is formed

Answer 1

Answer: (C)

The correct option is D $H_2{SO}_4$ is consumed
The electrodes of the cells in a lead storage battery consist of lead grids. Dilute sulfuric acid $H_{2}S{O}_4$ serves as the electrolyte. When the battery is delivering a current, i.e., discharging, the lead at the anode is oxidized. When the cell is under load, there is an electric field in the electrolyte that causes negative ions ($S{O}_4^{2-}$) to drift toward the anode plate. During the discharge operation, acid is consumed and water is produced.