题目

以粉煤灰（主要成分为Al2O3和SiO2，还含有少量的FeO、Fe2O3等）为原料制备Al2O3的流程如下： （1）“酸浸”时需加入过量的稀硫酸，写出Al2O3溶解的离子方程式                   。 （2）证明酸浸后溶液中存在Fe3+的方法是：取酸浸后的溶液少许置于试管中，向其中滴加硫氰化钾溶液，溶液变为血红色；再慢慢滴入过量的H2O2溶液，溶液的红色先变深，之后红色逐渐褪去，继续滴加会有气泡逸出，该气体会使带火星的木条复燃。 ①红色变深的原阅读下列短文，从每题所给的A、B、C、D四个选项中选出一个最佳答案。PaulMondayTuesdayWednesdayThursdayFridayGet up7:10a.m.7:10a.m.7:10a.m.7:10a.m.7:10a.m.MorningSchoolSchoolSchoolSchoolSchoolLunchpizzaricericericericeAfternoonyo-yotennistennistennisfootballEveninghomeworkhomeworkTVhomeworkhomeworkGo to bed10:15p.m.10:15p.m.10:15p.m.10:15p.m.10:15p.m.【1】Paul’s favourite sport is_______.A. volleyball B. tennis C. yo-yo D. football【2】On Wednesday evening, Paul usually _______.A. watches TV B. does his homeworkC. washes clothes D. visits friends【3】Which is NOT right?A. Paul goes to school from Monday to Friday. B. Paul goes to bed after ten.C. Paul has sports in the afternoon. D. Paul always has fish for lunch.