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What is the basic reaction in the battery of the ignition system?

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What is the basic reaction in the battery of the ignition system?

(a) PbO5 + Pb + 4H2SO4 = 4PbSO2 + 4H20

(b) 2PbO2 + 2H2SO4 = 2PbO + 2SO4 + 2H2O + O2

(c) PbO2 + Pb + 2H2SO4 = 2PbSO4 + 2H2O

(d) PbO2 + 2H2SO4 = 2PbSO4 + 2H2O

I had been asked this question in an interview for internship.

This question is from I.C Engine topic in division Internal Combustion Engine of Farm Machinery

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The correct choice is (c) PbO2 + Pb + 2H2SO4 = 2PbSO4 + 2H2O

To explain I would say: Sulphuric acid is used as an electrolyte, which contains about 35% sulphuric acid and 65% water. The specific gravity at full charge is about 1.270, while at complete discharge it is about 1.10.

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