Correct Option (d):
Statement 1 is correct. A standard motor car battery typically provides a nominal voltage of 12 V. This is achieved by connecting six 2 V lead-acid cells in series.
Statement 4 is correct. The capacity of a car battery is expressed in ampere-hours (Ah). This unit quantifies the amount of electrical charge a battery can deliver over time, indicating its ability to supply a certain current for a specified duration.
Incorrect Options:
Statement 2 is incorrect. The electrolyte used in a lead-acid car battery is diluted sulphuric acid (H₂SO₄), not hydrochloric acid.
Statement 3 is incorrect. The electrodes in a lead-acid battery are lead (Pb) for the negative plate and lead dioxide (PbO₂) for the positive plate. Copper is not used as an electrode material in these batteries.
Therefore, options including statements 2 or 3 are incorrect.