题目内容

【题目】下列说法中不正确的是（ ）

A.溶质的分子（或离子）和水分子作用，生成水合分子（或水合离子）的过程放出热量

B.溶质在溶解的过程中，有的放出热量，有的吸收热量

C.溶解过程中吸热过程是溶质的分子（或离子）和水分子作用，生成水合分子（或水合离子）的过程

D.有的溶质溶解时，扩散过程吸收的热量小于水合过程放出的热量，表现为溶液的温度升高

【答案】C

【解析】

试题分析：物质的溶解过程包括溶质的分子或离子的扩散过程和溶质的分子或离子的水合过程；分子或离子的扩散是吸热的过程，扩散后分子或离子的水合是放热过程；当放热过程大于吸热过程，溶液温度升高；当放热过程小于吸热过程，溶液的温度降低；当两个过程相当时，溶液温度不变。故A、B、D说法正确，C错误。故选C

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