Question

In the lead-acid battery during charging, the cathode reaction is

• A. formation of $ PbO_2 $
• B. formation of $ PbSO_{4} $
• C. reduction of $ Pb^{2+} $ to $ Pb $
• D. decomposition of $ Pb $ at the anode

Answer 1

Answer: (A)

The cell reactions during charging of lead storage battery are
At anode $PbSO_4(s) + 2e^- \rightarrow Pb(s) + SO_4^{2-} (aq)$
At cathode
$PbSO_4 (s) + 2H_2O \rightarrow PbO_2(s) + SO_4^{2-} (aq) - 4H^+ +2e^-$
Thus, at cathode, formation of $PbO_2$ takes place.