用酸性氢氧燃料电池电解苦卤水 (含Cl－、Br－、Na＋、Mg2＋)的装置如图所示(a、b为石墨电极)。
下列说法中正确的是
| A．电池工作时，负极反应式为：H2 +2 OH――2e－＝2H2O |
| B．电解时，a 电极周围首先放电的是Br－而不是Cl－，说明当其它条件相同时前者的还原性强于后者 |
| C．电解时，电子流动路径是：负极→外电路→阴极→溶液→阳极→正极 |
| D．忽略能量损耗，当电池中消耗0.32g O2 时，b 极周围会产生0.04g H2 |
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