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

  • A
    $PbSO_4(s) + 2H_2O(\ell) \rightarrow PbO_2(s) + SO_4^{2-}(aq.) + 4H^+(aq.) + 2e^-$
  • B
    $PbO_2(s) + 4H^+(aq.) + SO_4^{2-}(aq.) + 2e^- \rightarrow PbSO_4(s) + 2H_2O(\ell)$
  • C
    $Pb(s) + SO_4^{2-}(aq.) \rightarrow PbSO_4(s) + 2e^-$
  • D
    $PbSO_4(s) + 2e^- \rightarrow Pb(s) + SO_4^{2-}(aq.)$

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Suppose that an alkaline dry cell was manufactured using cadmium metal rather than $Zn$. What effect would this have on the standard emf of the cell? The standard reduction potential $E^o_{Cd^{2+}/Cd} = -0.40 \ V$ while $E^o_{Zn^{2+}/Zn} = -0.76 \ V$.

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Given that
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