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A lead storage battery is the most impor...

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.

Text Solution

Verified by Experts

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)`
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