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暗紫色固体A放在试管中加热,放出无色气体B,把铁丝放在气体B中能剧烈燃烧且火星四射,生成黑色固体C;另把一种无色溶液D和E混合后也可以立即产生气体B(E在化学反应前后质量没有变化).回答下列问题: (1)写出A、B、C、D、E各物质的名称: A______,B______,C______,D______,E______. (2)用文字表达式表示上述有关化学反应和反应类型:(按叙述的顺序书写) ①______; ②______; ③______. (3)E在上述反应中起______作用,是一种______剂.
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