a) PbO5 + Pb + 4H2SO4 = 4PbSO2 + 4H20
b) 2PbO2 + 2H2SO4 = 2PbO + 2SO4 + 2H2O + O2
c) PbO2 + Pb + 2H2SO4 = 2PbSO4 + 2H2O
d) PbO2 + 2H2SO4 = 2PbSO4 + 2H2O
Answer: c
Explanation: 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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