Please solve 4th qn

Dear student,

4) 
A lead storage battery consists of a lead anode, a grid of lead packed with lead oxide (PbO2) as the cathode, and a 38% solution of sulphuric acid (H2SO4) as an electrolyte.

When the battery is in use, the following cell reactions take place:

At anode: Pb(s) +SO42-(aq) PbSO4 (s) +2e-
At cathode: PbO2 (s)+SO42-(aq) +4H+(aq)+2e-PbSO4 (s)+2H2O(l)

The overall cell reaction is given by,
Pb(s) +PbO2 (s) +2H2SO4 (aq) 2 PbSO4 (s) + 2H2O(l)

When a battery is charged, the reverse of all these reactions takes place.

Hence, on charging, PbSO4 (s) present at the anode and cathode is converted into Pb(s) and PbO2 (s) respectively.

Regards

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