电视剧《西游记》中仙境美仑美奂,这些神话仙境中所需的烟雾是用

电视剧《西游记》中仙境美仑美奂,这些神话仙境中所需的烟雾是用NH4NO3和Zn粉按质量比8:6.5混合放于温热的石棉网上,使用时滴水数滴即产生大量的白烟。又知发生反应后有N2和水生成。有关的说法中正确的是( )

①水起着溶解NH4NO3,发生吸热现象以启动反应的发生的作用;②每还原1molNO3-需氧化1molNH4+和1molZn;③成烟物质是两性氧化物小颗粒;④成烟物质是小锌粒,它由NH4NO3反应放热而蒸出。

     A、①②      B、②③       C、③④       D、①④

答案

B


解析:

Cu的反应要经过Cu(Ⅱ)→Cu(0)→Cu(Ⅰ)的过程,这不符合氧化还原反应的规律(化合价的跳跃),只能认为Cu(Ⅱ)→Cu(Ⅰ)一步完成。所以本题采用化合价(电子得失)整体分析法,容易得答案B。

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