Which is the half-reaction at the anode in a lead storage battery? Select one: A

Question

Which is the half-reaction at the anode in a lead storage battery? Select one:

A. Pb(s) + SO42–(aq) ? PbSO4(s) + 2e–

B. Pb(s) ? Pb(s) + 2e–

C. H2(g) ? 2H+(aq) + 2e–

D. PbO2(s) + 4H+(aq) + 2SO42–(aq) + 2e– ? PbSO4(s) + 2H2O(l)

E. Pb(s) + PbO2(s) + 4H+(aq) + 2SO42–(aq) ? 2PbSO4(s) + 2H2O(l)

Which is the half-reaction at the cathode in a lead storage battery? Select one:

A. H2(g) ? 2H+(aq) + 2e–

B. PbO2(s) + 4H+(aq) + 2SO42–(aq) + 2e– ? PbSO4(s) + 2H2O(l)

C. Pb(s) ? Pb(s) + 2e–

D. Pb(s)+ PbO2(s) + 4H+(aq) + 2SO42–(aq) ? 2PbSO4(s) + 2H2O(l)

E. Pb(s) + SO42–(aq) ? PbSO4(s) + 2e–

Explanation / Answer

Half reaction at anode : option A, Oxidation of Pb (s) + SO42- (aq) ------> PbSO4 (s) + 2e-

PbO2+ 4H+ +2SO42- + 2e- - - - - - - > PbSO4 + 2 H2O

Half reaction at cathode: option B

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