Battery
In a lead storage battery during discharge, the reaction at anode is:
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About This Question
- Subject
- chemistry
- Chapter
- redox reactions and electrochemistry
- Topic
- battery
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Pb + SO₄²⁻ → PbSO₄ + 2e⁻
In a Lead Storage Battery, the anode consists of lead (Pb) and the electrolyte is 38%H2SO4.
- During Discharge (acting as a galvanic cell):
- At Anode (Oxidation): Lead is oxidized. However, because SO42− ions are present, the Pb2+ ions immediately precipitate as insoluble lead sulfate. Pb(s)+SO42−(aq)→PbSO4(s)+2e−
- At Cathode (Reduction): PbO2 is reduced. PbO2+SO42−+4H++2e−→PbSO4+2H2O
- Note that both reactions consume sulfuric acid and produce PbSO4.
This medium difficulty chemistry question is from the chapter redox reactions and electrochemistry, covering the topic of battery. It appeared in the 2025 exam.
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