Discussion
Which reaction occurs at the positive plate during discharge?
Answer: C
Both plates convert to lead sulphate on discharge, the positive from lead dioxide and the negative from sponge lead. Charging reverses both reactions. Confusing the plate or the direction is the usual error, which is why each option is a genuine half truth. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Tracing the requirement back to the physical constraint that produces it makes the answer follow.
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