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A read storage battery is the most impot...

A read storage battery is the most impotant 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))` battery holds 3.5 L of the acid. During the discharge of the battery, the density of `H_(2)SO_(4)` falls to 1.139 g `mL^(-1).(20%H_(2)SO_(4)` by mass)
Write the reaction taking place at the cathode when the battery is in use.

A

`Pb^(2+)+2e^(-)toPb`

B

`Pb^(2+)+SO_(4)^(2-)toPbSO_(4)`

C

`PbtoPb^(2+)+2e^(-)`

D

`PbSO_(4)+2H_(2)Oto2PbO_(2)+4H^(+)+SO_(4)^(2-)+2e^(-)`

Text Solution

Verified by Experts

The correct Answer is:
D
At anode, oxidation occurs. `PbSO_(4)` is oxidized to `PbO_(2)` according tor eaction (d).
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A read storage battery is the most impotant 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)) battery holds 3.5 L of the acid. During the discharge of the battery, the density of H_(2)SO_(4) falls to 1.139 g mL^(-1).(20%H_(2)SO_(4) by mass) Lead storage battery is considered a secondary cell. Why?

A read storage battery is the most impotant 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)) battery holds 3.5 L of the acid. During the discharge of the battery, the density of H_(2)SO_(4) falls to 1.139 g mL^(-1).(20%H_(2)SO_(4) by mass) How much electricity in terms of Faraday is required to carry out the reduction of one mole of PbO_(2) ?