24. The electrochemical reaction which powers a lead-acid storage battery is as

Question

24. The electrochemical reaction which powers a lead-acid storage battery is as follows: Pb(s) + PbO2(s) + 4H'(aq) + 2SO42-(aq) 2PbSO4(s) + 2H,0(1) A single cell of this battery consists of a Pb electrode and a Pbo, electrode, each submerged in sufuric b electrode and a Pbo2 electrode, each submerged in sulfuric acid. What reaction occurs at the cathode during discharge? A) Pb(s) is reduced to PbsO (s). B) PbO2(s) is reduced to PbSO4(s) C) PbO2(s) is oxidized to PbSO4(s). D) Pb(s) is oxidized to PbsO (s). E) H' is oxidized to H,0(0)

Explanation / Answer

24. For the given electrochemical cell,

The reaction occruing at the cathode during discharge is,

B) PbO2 is reduced to PbSO4(s)

Pb goes from +4 oxidation state to +2 oxidation state

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