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【简答题】
（10分） A、B、C、D、E是中学常见的五种物质，其转化关系如图所示。反应I、II均在水溶液中进行，其中某些物质可能已略去。已知D是双原子分子形成的单质，C、E是化合物。 （1）若A是气态单质，其水溶液具有漂白性，D在常温下为固态。E是一种可溶性强碱，其焰色反应为黄色。则 ①A、C的化学键类型分别为 ， ； ②写出C的一种用途 ； ③写出A+B→C+D反应的化学方程式 。 （2）若A是金属单质，D是无色气体，E是A的盐溶液。则 ①D的化学式是 ②A和E发生反应的离子方程式为 。
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