Consider the following statements regarding a motor car battery:1. The voltage is usually 12 V.2. Electrolyte used is hydrochloric acid.3. Electrodes are lead and copper.4. Capacity is expressed in ampere-hour.Which of the above statements are correct?
✓ Correct answer: d) 1 and 4
ExplanationStatement 1 is correct: Most car batteries are 12-volt lead-acid batteries.This is the standard voltage for automotive applications as it provides sufficient power for starting the engine and running electrical systems in vehicles.Statement 2 is incorrect: The electrolyte used in a car battery is sulfuric acid (H₂SO₄), not hydrochloric acid.Sulfuric acid is mixed with distilled water to create the electrolyte solution, which facilitates the electrochemical reactions in the battery.Statement 3 is incorrect: The electrodes in a car battery are made of lead (Pb) and lead dioxide (PbO₂), not copper.The negative electrode (anode) is made of pure lead, and the positive electrode (cathode) is made of lead dioxide.Statement 4 is correct: The capacity of a car battery is expressed in ampere-hours (Ah).This unit measures the amount of charge a battery can deliver over time.For example, a 50 Ah battery can theoretically deliver 1 ampere of current for 50 hours or 5 amperes for 10 hours.279
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