MDCAT Chemistry MCQ #5423

In a lead storage battery, several chemical changes occur during the discharge cycle. What reaction takes place at the cathode (positive electrode) during this process?

MDCAT Chemistry MCQ #5423

  1. Question 1

    Q1. In a lead storage battery, several chemical changes occur during the discharge cycle. What reaction takes place at the cathode (positive electrode) during this process?

    • A) Lead(IV) oxide is reduced to Lead(II) sulfate
    • B) Lead metal is oxidized to Lead(IV) oxide
    • C) Sulfuric acid is produced at the cathode
    • D) Oxygen gas is evolved at the anode

    Answer: Lead(IV) oxide is reduced to Lead(II) sulfate

    Explanation: During discharge, PbO2 is reduced to PbSO4 at the cathode while Pb is oxidized to PbSO4 at the anode; both electrodes become coated with PbSO4.