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)

formation of $PbO_2$

Answer 2

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