Discussion
Assertion (A): A discharged battery should be left discharged until it is next needed.
Reason (R): Lead sulphate crystallises into a hard form when a battery stands discharged.
Select the correct answer from the options below.
Answer: D
The reason is correct and it is precisely why the assertion is wrong: standing discharged is what causes the permanent capacity loss. A maintenance charger keeps the sulphate in its soft convertible form indefinitely. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Most errors here come from carrying across a result from a neighbouring case where it does not hold. A symptom that appears under one condition and not another is what narrows the diagnosis quickly.
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