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    【题目】下列反应：①氢氧化钠与硫酸，②一氧化碳与氧气，③八水合氢氧化钡与氯化铵，④金属铜与硝酸银。其中(用序号填空)：

    (1)属于放热反应的是_______________________________。

    (2)属于吸热反应的是_______________________________。

    (3)能设计成原电池的反应是_________________________。

    (4)能设计成燃料电池的反应是_______________________。

    【答案】(1)①②④ (2)③ (3)②④ (4)②

    【解析】酸碱中和反应、燃烧、活泼金属置换不活泼金属反应属放热反应，③属于典型的吸热反应。燃烧和置换反应一定是氧化还原反应，理论上均可设计成原电池，且CO燃烧可设计成燃料电池。

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