下列说法正确的是( ) A．1mol可燃物燃烧生成氧化物放出的热

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问题选择题

下列说法正确的是( )

A．1mol可燃物燃烧生成氧化物放出的热量就是该物质的燃烧热

B．因为醋酸是弱电解质，盐酸是强电解质，所以中和等体积等物质的量浓度的醋酸和盐酸时，中和醋酸消耗的NaOH比盐酸消耗的NaOH用量少

C．反应物总能量大于生成物总能量的反应是放热反应

D．强电解质溶液的导电能力比弱电解质溶液的导电能力强

答案

答案：C

燃烧热是在一定条件下，1mol可燃物完全燃烧生成稳定的氧化物时所放出的热量，使用选项A不正确；等体积等物质的量浓度的醋酸和盐酸的物质的量是相等的，因此消耗的氢氧化钠是相等的，B不正确；溶液的导电性只与溶液中自由移动的离子大小有关系，而与电解质的强弱是无关系的，选项D不正确，因此正确的答案选C。

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