题目：
已知铅蓄电池放电时发生如下反应：负极：Pb+SO42--2e-＝PbSO4，正极：PbO2+4H++SO42-+2e-＝PbSO4+2H2O，当铅蓄电池放电转移的电子能氧化Cl-制得Cl2 22.4L（标况）时，电池内消耗的硫酸的物质的量至少是[ ]
A．2.5 mol
B．5 mol
C．1 mol
D．2 mol
答案：
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