Discussion
Which condition does sulphation describe?
Answer: C
Leaving a battery discharged lets soft sulphate crystallise into a hard form that resists conversion, permanently reducing capacity. Terminal corrosion and plate shedding are genuinely different failure modes of the same battery. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. The order in which the effects act is what decides the outcome, so it is worth establishing first. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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