The electrochemical reaction that powers a lead-acid storage battery is as follows: Pb(s) + PbO₂(s) + 4 H⁺(aq) + 2 SO₄^2-(aq) → 2 PbSO₄(s) + 2 H₂O( )
A single cell of this battery consists of a Pb electrode and a PbO₂ electrode,each submerged in sulfuric acid.Which of the following reactions occurs at the cathode during discharge?

Question

The electrochemical reaction that powers a lead-acid storage battery is as follows: Pb(s) + PbO₂(s) + 4 H⁺(aq) + 2 SO₄^2-(aq) → 2 PbSO₄(s) + 2 H₂O(

The electrochemical reaction that powers a lead-acid storage battery is as follows: Pb(s) + PbO<sub>2</sub>(s) + 4 H<sup>+</sup>(aq) + 2 SO<sub>4</sub><sup>2-</sup>(aq) → 2 PbSO<sub>4</sub>(s) + 2 H<sub>2</sub>O( ) A single cell of this battery consists of a Pb electrode and a PbO<sub>2</sub> electrode,each submerged in sulfuric acid.Which of the following reactions occurs at the cathode during discharge? A) Pb(s) is reduced to PbSO<sub>4</sub>(s) . B) PbO<sub>2</sub>(s) is reduced to PbSO<sub>4</sub>(s) . C) PbO<sub>2</sub>(s) is oxidized to PbSO<sub>4</sub>(s) . D) Pb(s) is oxidized to PbSO<sub>4</sub>(s) . E) H<sup>+</sup> is oxidized to H<sub>2</sub>O( ) .

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A single cell of this battery consists of a Pb electrode and a PbO₂ electrode,each submerged in sulfuric acid.Which of the following reactions occurs at the cathode during discharge?

Quizplus · Accepted Answer

During discharge, the PbO2 electrode (also called the positive electrode or the anode) undergoes reduction to form PbSO4 while the Pb electrode (also called the negative electrode or the cathode) undergoes oxidation to form PbSO4. Thus, the reaction at the cathode can be represented as: Pb(s) + HSO4- → PbSO4 + H+ + 2e-. Therefore, the correct choice is B because PbO2 is reduced at the anode and not at the cathode.

The Electrochemical Reaction That Powers a Lead-Acid Storage Battery Is