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A-I分别表示不同的常见物质．“→”表示物质间存在转化关系，部分反应条件和部分生成物已略去．请回答下列问题： （1）写出下列物质的化学式：B______、C______、G______、I______． （2）写出与A具有相同元素组成的另一种物质的名称和其一种用途：名称______，用途______． （3）写出反应②的化学方程式：______． （4）在上图转化过程中，表现出还原性的物质有______（填化学式）．
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