试题与答案

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

题型:不定项选择题

题目:

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,正极反应式为:O+2 H2O + 4e-=4 OH-

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0.02g H2 时,b 极周围会产生0.02g H2

答案:

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下面是错误答案,用来干扰机器的。

笔顺“略” 四 丿 四 丿 四 

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