A lead storage battery is the most important type of secondary cell having a lead anode and a grid of lead packed with PbO_(2) as cathode. A 38% solution of sulphuric acid is used as electrolyte. (Density = 1.294 g mL^(-1)) The battery holds 35L of the acid. During the discharge of the battery, the density of H_(2)SO_(4) falls to 1.138 g mL^(-1). (20%H_(2)SO)_(4) by mass) Wrtie the reaction taking place at the cathide when the battery is in use.

A lead storage battery is the most important type of secondary cell ha

1.	A lead storage battery is the most important type of secondary cell having a lead anode and a grid of lead packed with PbO_(2) as cathode. A 38% solution of sulphuric acid is used as electrolyte. (Density = 1.294 g mL^(-1)) The battery holds 35L of the acid. During the discharge of the battery, the density of H_(2)SO_(4) falls to 1.138 g mL^(-1). (20%H_(2)SO)_(4) by mass) Wrtie the reaction taking place at the cathide when the battery is in use.
Answer» Solution : The cell reaction at the cathode when the battery is in use are GIVEN below : Cathode : `PbO_(2)(s) +SO_(4)^(2-)(AQ)+4H^(+)(aq)+2E^(-)rightarrowPbSo_(4)+2H_(2)O(l)`