Which of the following reactions occurs at the cathode during the charging of a lead storage battery?

  • A
    $Pb^{2+} + 2e^{-} \to Pb$
  • B
    $Pb^{2+} + SO_4^{2-} \to PbSO_4$
  • C
    $Pb \to Pb^{2+} + 2e^{-}$
  • D
    $PbSO_4 + 2H_2O \to PbO_2 + 4H^{+} + SO_4^{2-} + 2e^{-}$

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