Which acid is used in a typical lead-acid car battery?
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → Sulphuric Acid
A lead-acid car battery has plates of lead and lead dioxide dipped in dilute sulphuric acid, \(\ce{H2SO4}\), which is the electrolyte. When the battery gives current, both plates turn into lead sulphate and the acid becomes weaker; charging the battery reverses the change and makes the acid strong again.
\(\ce{Pb + PbO2 + 2H2SO4 -> 2PbSO4 + 2H2O}\)