题目

He was unhappy when he sold his violin．After all，he________it for a very long time． A . has had B . had had C . has D . had 答案：B在含Fe3＋的S2O82-和I－的混合溶液中，反应S2O82-（aq）+2I－（aq）=2SO42-（aq）+I2（aq）的分解机理及反应进程中的能量变化如图：步骤①：2Fe3＋（aq）＋2I－（aq）＝I2（aq）＋2Fe2＋（aq）步骤②：2Fe2＋（aq）+S2O82-（aq）=2Fe3＋（aq）+2SO42-（aq）下列有关该反应的说法正确的是A. 反应速率与Fe3＋浓度有关B. Fe2＋是该反应的催化剂C. v（S2O82-）＝v（I－）＝v（I2）D. 若不加Fe3＋，则正反应的活化能比逆反应的大