问题
单项选择题 A1/A2型题
下列阳离子中，能与氨形成络离子的是（）
A.Ca2+
B.Fe2+
C.Sc+
D.K2+
E.Cu3+
答案
参考答案：E
解析：氨分子中的氮原子拥有一对孤对电子，而铜离子又有空的电子轨道(4s，4p)，所以它们可以形成配位键，形成铜氨络离子。
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下列阳离子中，能与氨形成络离子的是（）
A.Ca2+
B.Fe2+
C.Sc+
D.K2+
E.Cu3+
参考答案：E
解析：氨分子中的氮原子拥有一对孤对电子，而铜离子又有空的电子轨道(4s，4p)，所以它们可以形成配位键，形成铜氨络离子。
| 阅读理解。 |
| No air means death. Although we can not see it, there is air round us. So air is everywhere and it gives life to every living thing. Without it we can not live. Bad air makes people ill. We must have fresh air to keep us in good health. In the city there are a great many people and there are too many cars running on the roads. The gas which the cars spread out is full of poison. Everyday we breathe it in again and again. This makes us feel sick. Therefore people should go out of door as much as they can. Besides so many cars, there are many factories too. From the chimneys of these factories, we get the smoke usually in black or grey colour. This kind of smoke, when it mixes the air, is dangerous to our health. It is because smoke contains many small poisonous solids and gases. So in order to keep us healthy we have to go out to the countryside to breathe more fresh air. Or we can go up hills to get more fresh air. |
| 1. which of the following titles is the best for this passage? |
[ ] |
| Ａ: Air Ｂ: Fresh Air Ｃ: Breathing Air Ｄ: The Use of Air |
| 2. ____ could live without air. |
[ ] |
| Ａ: Fish Ｂ: Anything Ｃ: Fruit Ｄ: Nothing |
| 3. Although we can not see it there is _____ all around us. |
[ ] |
| Ａ: gas Ｂ: poison Ｃ: water Ｄ: smoke |
| 4. Air gives ____to all living things. |
[ ] |
| Ａ: life Ｂ: live Ｃ: death Ｄ: health |
| 5. We must have fresh air to keep our ____. |
[ ] |
| Ａ: breath Ｂ: health Ｃ: wealth Ｄ: death |