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【简答题】
下列变化中所涉及到的物质都是初中化学常见的物质，已知A、B常温下为液态，C、G为单质，G为黑色固体，医疗上用F来配制生理盐水。试回答下列问题： ① A在一定条件下反应生成B和C； ②D与E反应生成F和B； ③C与G在不同条件下反应生成H或I； ④J和K分别与D反应B、F和I， J中的组成元素比K多一种。 （1）写出A在一定条件下生成B和C的化学反应方程式 ________________； （2）写出H 的用途________（写一条） （3）D所属物质类别______________(填“酸、碱、盐或氧化物”）； （4）写出E的化学式_________ 。 （5）④中的变化涉及到的化学反应方程式__________________， _____________________。
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