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【简答题】
下 图为化学能与电能相互转化的装置示意图。 (1)在甲图中,锌极为 ________ 极 (填“正”或 “负”),该极的电极反应式是 _____________________ ;有 H 2 逸出的电极为 ________ 极 (填“锌”或“石墨”)。溶液中 SO 4 2- 向 _______ 极 (填“锌”或“石墨”)移动。 (2)在,a和b均为惰性石墨电极,NaC l 溶液中滴有酚酞。接通电源一段时间后,发现 a极先变红。则电源的M极为 ______ 极 (填“正”或“负”),b电极的电极反应式是 ___________________________ ,乙装置中反应的化学方程式是 ______________________ 。假如电路中有 4 mol电子通过,a电极理论上析出气体的体积是 __________ L(标准状况)。
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