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某化学小组同学按如图所示装置和表中所给试剂进行实验(图中铁架台等夹持仪器已略去): (1)在试管I中加入试剂后,塞紧橡皮塞,关闭止水夹a,打开止水夹b,试管Ⅱ中液面上升,溶液变浑浊.符合以上实验现象的试剂是 _________ 组,此时Ⅱ中发生反应的化学方程式为 ____ __ ___ ,出现上述现象的原因是 ____ ____ _ . (2)在试管I中加入试剂后,塞紧橡皮塞,立即打开止水夹a,关闭止水夹b,试管Ⅱ中有气泡冒出,溶液变浑浊.符合以上实验现象的试剂是 _________ 组.
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