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某兴趣小组探究金属的反应规律． 【探究】在室温条件下进行如图所示实验． （1）实验室稀释浓硫酸时，需要用到的实验仪器有______． （2）将形状和大小相同、表面均打磨洁净的镁和铁放入试管内，在两试管内同时加入等质量、等质量分数的稀硫酸．若要比较镁和铁的金属活动性，观察到的实验现象是______． （3）若实验所用的过量，则装置甲中产生的H 2 的质量______（选填“大于”、“小于”或“等于”）装置产生的H 2 质量． 【探究】将一定量的镁粉加入到硫酸亚铁和硫酸铜的混合溶液中，充分反应后过滤，将滤出的固体放入少量稀硫酸中，没有气泡产生．那么，滤出的固体和滤液中分别一定含有______．
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