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【简答题】
如图是三个原电池的装置图． （1）在甲装置中，作为负极的物质是______，在正极上发生的变化可表示为：2H + +2e - ═H 2 ↑；如果在正极转移了0.2mole - ，则在正极可产生标准状况下H 2 的体积约为______L，负极转移电子的物质的量为______mol． （2）在乙、丙装置中，Fe均为负极，C、Ag分别为正极；由此可知，在原电池中，一般是用______的物质作为负极．
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