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第Ⅰ卷（选择题，共84分）一、选择题：（本题包括5小题，每小题3分，共15分。每小题只有一个选项符合题意。）根据以下叙述，回答1～2小题。把硫粉溶于煮沸的Na2SO3溶液可制得Na2S2O3：Na2SO3十SNa2SO3。若向Na2S、Na2SO3组成的混合溶液中慢慢通入SO2至过量，可见到下列现象：
Volume I (Multiple-choice questions, a total of 84 points) First, multiple-choice questions: (This question consists of 5 questions, each question 3 points, a total of 15 points. Each question has only one option to meet the question meaning.) According to the following statement, answer 1 ~ 2 small questions. The sulfur powder was dissolved in a boiled Na2SO3 solution to obtain Na2S2O3:Na2SO3 <RTIgt;SNa2SO3.</RTI> If SO2 is slowly added to a mixed solution consisting of Na2S and Na2SO3, the following phenomena can be observed: