A lead storage battery consists of a lead anode and a grid of lead packed with lead dioxide as the cathode. The electrolyte taken is 39% H_(2)SO_(4) by mass having a density of 1.294 g mL^(-1). The battery holds 3.5 L of the acid. During the discharge of the battery, the density H_(2)SO_(4) falls from 1.294 g mL^(-1) to 1.139 g mL^(-1) which is 20% H_(2)SO_(4) by mass Q. The reacton occurring at the andoe during charging is

A lead storage battery consists of a lead anode and a grid of lead pac

1.	A lead storage battery consists of a lead anode and a grid of lead packed with lead dioxide as the cathode. The electrolyte taken is 39% H_(2)SO_(4) by mass having a density of 1.294 g mL^(-1). The battery holds 3.5 L of the acid. During the discharge of the battery, the density H_(2)SO_(4) falls from 1.294 g mL^(-1) to 1.139 g mL^(-1) which is 20% H_(2)SO_(4) by mass Q. The reacton occurring at the andoe during charging is
Answer» `Pb^(2+)+2e^(-)toPb` `Pb^(2+)+SO_(4)^(2-)toPbSO_(4)` `PbtoPb^(2+)+2e^(-)` `PbSO_(4)+2H_(2)Oto2PbO_(2)+4H^(+)+SO_(4)^(2-)+2e^(-)` Solution :At ANODE, oxidation occurs. `PbSO_(4)` is oxidized to `PbO_(2)` ACCORDING tor EACTION (d).