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【单选题】
为达到预期的实验目的，下列操作正确的是 ( ) ①配制FeCl 3 溶液时，将FeCl 3 固体溶于盐酸中，然后再加蒸馏水稀释到所需的浓度 ②用10 mL量筒量取4.80 mL的浓硫酸 ③蒸发溶液时，边加热边搅拌，直至蒸发皿中的液体蒸干 ④向无色溶液中加BaCl 2 溶液，生成白色沉淀，再加稀硝酸，沉淀不消失，由此确定该溶液中一定含有SO 4 2 — ⑤为鉴别KCl、AlCl 3 和MgCl 2 溶液，分别溶液中滴加NaOH溶液至过量 ⑥中和热测定的实验中使用的玻璃仪器只有2种 ⑦实验室可利用浓氨水和碱石灰混合的方法制取少量氨气 ⑧除NO中混有的NO 2 气体可通过，再干燥后用向上排空气法收集 ( )A.
③⑤⑧
B.
④⑤⑥
C.
①⑤⑦
D.
①⑦⑧
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举一反三
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