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Lead-acid storage battery during discharge involves the overall reaction
APb + 2H⁺ → Pb²⁺ + H₂ (typical)
BZn + 2HCl → ZnCl₂ + H₂
CCu²⁺ + 2e⁻ → Cu
DPb + PbO₂ + 2H₂SO₄ → 2PbSO₄ + 2H₂O
Answer & Solution
Correct answer: D. Pb + PbO₂ + 2H₂SO₄ → 2PbSO₄ + 2H₂O
1. At the anode: Pb + SO₄²⁻ → PbSO₄ + 2e⁻.
2. At the cathode: PbO₂ + 4H⁺ + SO₄²⁻ + 2e⁻ → PbSO₄ + 2H₂O.
3. Net: Pb + PbO₂ + 2H₂SO₄ → 2PbSO₄ + 2H₂O during discharge.
_Source: Maharashtra Balbharati Std XII Chemistry, Ch 5 "Electrochemistry" §5.11_
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