Question

Give chemical equation for both charging and diacharging of dry cell,mercury cell,lead storage battery,nickel cadmium celland furl cell?

Answer 1

Lead storage battery :
Discharging reaction - Pb(s) + PbO_​2(s) + 2H₂SO₄(aq) $\to$ 2PbSO₄ (s) + 2H₂O
Charging reaction - ​2PbSO₄ (s) + 2H₂O $\to$ ​Pb(s) + PdO_​2(s) + 2H₂SO₄(aq)

Nickel-cadmium cell :
Dis​charging reaction - Cd(s) + 2Ni(OH)₃ (s)$\to$ CdO(s) + 2Ni(OH)₂ (s) + H₂O (l)
charging reaction​ - CdO(s) + 2Ni(OH)₂ (s) + H₂O (l)​ $\to$ Cd(s) + 2Ni(OH)₃ (s)​

Mercury cell :
Discharging reaction - Zn(Hg) + HgO(s) $\to$ZnO(s) + Hg (l)


Fuel cell :
Discharging reaction - 2H₂(g) + O₂(g) $\to$2H₂O (l)
charging reaction - ​2H₂O (l) $\to$2H₂(g) + O₂(g)