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一、选择题(每小题有1-2个选项符合题意) 1．(四川省)下列物质分别放入或通入水中,不能形成溶液的是( ) (A)食用油 (B)酒精 (C)食盐 (D)氯化氢气体 2．(长沙市)下列说法中正确的是( ) (A)不饱和溶液降温不一定会变成饱和溶液 (B)饱和溶液一定是浓溶液 (C)溶液中溶质质量分数的大小只由所含溶质质量决定 (D)相同温度下,饱和溶液一定比不饱和溶液浓 3．(绍兴市)夏天,实验员在实验室制了一瓶饱和的硝酸钾溶液并密封放置,到了冬天发现瓶底有大量的晶体析出,这是因为( ) (A)变成了不饱和溶液
First, the multiple-choice questions (1-2 questions for each question is consistent with the meaning of the question) 1. (Sichuan Province) The following substances are put into or pass through the water, and the solution that cannot be formed is () (A) edible oil (B) alcohol (C) salt (D) hydrogen chloride gas 2. (Changsha) The correct ones in the following statements are () (A) Unsaturated solution cooling does not necessarily become saturated solution (B) Saturated solution must be concentrated solution (C) Solution solute mass fraction size only by the contained solute Quality decision (D) At the same temperature, the saturated solution must be thicker than the unsaturated solution. (Shaoxing City) In the summer, the laboratory technician made a bottle of saturated potassium nitrate solution in a laboratory and sealed it. In the winter, a large amount of crystals precipitated from the bottom of the bottle. This is because () (A) becomes an unsaturated solution.