Books are out best friends. They give us both knowledge and pleasure. With books, our life is interesting.84．Books are so great friends of ours that we can turn to them for help whenever we meet with difficulty.

However, we should make use of books. As there are bond of different kinds, we should read them in different ways.．In my opinion, some books are to be read carefully and we must think over and learn something from them. Some should be just looked through. There are a few books that we should never read, for they are not good for us.85．The most important thing that we must try to put what we learn from books to practice.

机动车排放的尾气是空气的主要污染源之一，其成分之一是NO。某化学兴趣小组的同学在查阅资料后得知：

①NO在常温下是一种无色、难溶于水的气体，密度比空气略小；

②NO在常温下能与氧气迅速反应，生成红棕色的NO₂气体：2NO+O₂==2NO₂；

③实验室常用铜与稀硝酸反应制取NO：3Cu +8HNO₃（稀）==3Cu( NO₃)₂ +2NO ↑+4X。根据以上信息，完成下列问题：

(1)物质X的化学式为_________ 。

(2)若从下图中选择合适的装置来制取并收集NO气体，你选择的发生装置是____，收集装置是______。

(3)实验时在发生装置中可以观察到：铜片不断溶解并得到蓝色溶液。还能观察到的现象有_________。

(4)兴趣小组的同学通过查阅资料还得知：

①NO容易和血红蛋 白结合而使人中毒；

②NO能抗击侵入人体的微生物，并能阻 止癌细胞的繁殖和肿瘤细胞的扩散。综合分析①和②的信 息，你得到的启示是___________。

(5)某化工厂准备以铜和稀硝酸为主要原料生产Cu( NO₃)₂，设计了两种方案：

方案一:3Cu +8HNO₃（稀）==3Cu(NO₃)₂ +2NO ↑+4X;

方案二：2Cu+O₂2CuO, CuO + 2HNO₃ (稀)==Cu( NO₃)₂ +H₂O。从经济效益和环境保护的角度考虑，你认为较合理的方案是 ____。选择此方案的理由是____。