题目

各取0.1 mol铜分别投入足量的下列四种酸中(必要时可加热)：①浓硫酸；②浓HNO3；③稀H2SO4；④稀HNO3。充分反应后在相同条件下得到的气体体积由大到小的顺序是A．②④①③  B．②①④③C．①②④③  D．③④①②  答案：B 解析:铜与稀H2SO4不反应，由于铜的量一样，因此与其他三种酸反应时三种酸得电子数都相等，每生成1 mol气体得电子数：浓H2SO4～SO2～2e－，浓HNO3～NO2～1e－，稀HNO3～NO～3e－，因此产生气体的物质的量为②>①>④>③。  根据表格提供的信息，选择最佳答案 (1) All the animals above are ________. [　　] A．from China B．from Africa C．in the zoo (2) Which animal is full of fun? [　　] A．An elephant. B．A tiger. C．Monkey. (3) Now Mr. and Mrs. Green are going to the zoo with their five-year-old son. How much will they pay for tickets? [　　] A．Six yuan. B．Ten yuan. C．Twelve yuan. (4) Which is the visiting time? [　　] A．8∶30a.m. on Monday. B．5∶00p.m.on Thursday. C．8∶30a.m.on Saturday. (5) We can ________ in the zoo. [　　] A．give food to the animals B．throw dirty things C．not go close to the animals