在近两次的高三月考中,笔者调查了近150份化学试卷,发现有相当数量的题是由于学生在思维上出现“断层”而导致了错误,这些错误反映出部分学生思维上的不严密。 <原题重现>已知Co2O3在酸性溶液中易被还原成Co2+。Co2O3、Cl2、FeCl3、I2的氧化性依次减弱。下列反应在水溶液中不可能发生的是( ) In the recent two-month high school exams, the author investigated nearly 150 chemistry papers and found that a considerable number of questions were caused by students’ mistakes in their thinking. These errors reflected the fact that some students did not think well. tight. It is known that Co2O3 is easily reduced to Co2+ in an acidic solution. The oxidizing properties of Co2O3, Cl2, FeCl3, and I2 are weakened in turn. The following reactions are unlikely to occur in aqueous solution ()