Write the CHMemistry of reCHMarging of lead storage battery highlighting all the materials that are involved during reCHMarging.

Explanation

A lead storage battery consists of anode of lead, cathode of a grid of lead packed with lead dioxide `(PbO_(2))` and 38% solution of sulphuric acid as electrolytic. When the battery is in use, the following reactions take place: ltBrgt At anode: `Pb(s)+SO_(4)^(2-)(aq)toPbSO_(4)(s)+2e^(-)` . . . (i)
At cathode: `PbO_(2)(s)+SO_(4)^(2-)(aq)+4H^(+)(aq)+2e^(-)toPbSO_(4)(s)+2H_(2)O(l)` . . . (ii)
Overall reaction: `overline(Pb(s)+PbO_(2)(s)+2H_(2)SO_(4)(aq)to2PbSO_(4)(s)+2H_(2)O(l)" ")`
On charging the battery, the reverse reactio takes place, i.e., `PbSO_(4)` deposited on the electrodes is oververted back into Pb and `PbO_(2)` and `H_(2)SO_(4)` is regenerated. Reverse of reaction (i) will be reduction and hence will take place at cathode. reverse of reaction (ii) will be oxidation and hence will take place at anode.