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（2011年江苏泰州，26题）已知：①金属钠是一种活泼的金属，与水反应生成氧氧化钠和氢气；②难溶于水的碱受热分解生成相应的氧化物和水。A、B、C、D、E、F、G、H是初中化学中常见的物质，甲、乙、丙是三种金属。其中甲最活泼，红色金属，丙能被磁铁吸引。各物质间相互转化关系如下图： 请回答下列问题： (1)写出A、E、G的化学式：A ▲ ____，E ▲ ____，G ▲ ____。 (2)操作X的名称是 ▲ ____。 (3)①无色溶液D与蓝色溶液F反应的化学方程式为____ ▲ ____； ②与无色液体A反应的化学方程式为____ ▲ ____，该反应的基本类型____ ▲ ________； ③蓝色沉淀H受热分解反应的化学方程式为____ ▲ ____。 (4)甲、乙、丙三种金属的活动性由强到弱的顺序是____ ▲ ____，无色气体C在点燃或加热前必须进行的操作是 ▲ ____。
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