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M、R都是生活中常见的金属单质，其中R是用量最多的金属．甲、化合物，其中甲是黑色晶体，可由R在X中燃烧得到． （1）M与甲在高温下反应的化学方程式是______． （2）电解法制R低价氢氧化物的装置如图．a是4mol?L -1 NaCl、1mol?L -1 NaOH的混合溶液． ①配制a时需要除去蒸馏水中溶解的O 2 ，常采用______的方法． ②石墨电极应与电源的______（填“正”或“负”）极相连接，通电后，R电极附近的现象是______，R极的电极反应式是______． ③停止实验一段时间后，在R极上部有红褐色物质产生，反应的化学方程式是______． （3）把R的某氧化物粉末与M粉末混合后分成两等份．一份在高温下恰好完全反应后，再与足量盐酸反应；另一份直接放入足量的烧碱溶液中充分反应．前后两种情况下生成的气体质量比是a：b，则R的氧化物的化学式是______．
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