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【单选题】
该图装置中，A为铅蓄电池，C 1 、C 2 为石墨电极，B烧杯中是浓度均为0.1mol/L的H 2 SO 3 和KI的混合溶液100mL．下列说法正确的是（　　）
A.
铅蓄电池工作一段时间后，A中溶液的PH变小
B.
当B烧杯中I - 的浓度降为0.05mol/L时，A中消耗的H 2 SO 4 的物质的量为0.025mol
C.
当C 1 、C 2 两极均开始产生气体时，至少已有3.6×10 22 个电子从电路中流过
D.
铅蓄电池工作时，负极电极反应式为：PbO 2 -2e - +H 2 SO 3 =PbSO 4 +2H 2 O+SO 4 2-
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