在酸性介质中，向MnSO4溶液中滴加(NH4)2S2O8（过二硫酸铵）溶液会发生如下离子反应：
，下列说法正确的是：
| A．X是 H2O |
| B．还原性：SO42->Mn2+ |
| C．该反应中酸性介质可以为盐酸 |
| D．每生成0.1 molSO42-转移电子0.05 mol |
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