下列关于钠及其化合物的叙述正确的是 ( )。
A．将足量的Na2O2和Na2O分别加入酚酞试液中，最终溶液均为红色
B．用钠与空气反应制纯净的Na2O2，空气必须经过碱石灰处理后，才能与钠反应
C．钠与钠离子都具有强还原性
D．在Na2O2与CO2的反应中，氧化剂是Na2O2，还原剂是CO2
答案：B
Na2O2、Na2O分别加入酚酞试液中，均先与试液中的水反应生成碱而使试液变红色，但因Na2O2具有漂白性，最后又将变成红色的酚酞漂白，故A不正确。用Na与空气反应制Na2O2，空气中的CO2和水可与生成的Na2O2反应引入杂质，所以空气必须经碱石灰处理，故B正确。钠原子最外层只有一个电子，容易失去最外层电子形成钠离子，表现强还原性，而钠离子具有稳定的电子层结构，不具有还原性，只具有弱氧化性，故C不正确。D项反应中，氧化剂和还原剂均为Na2O2，故D不正确。
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| Qu Yuan was born in China around 2000 years ago. His job was to give some 1 to the king. The old king always took his advice. 2 the new king didn't like listening to Qu Yuan after the old king 3 . Qu Yuan finally 4 his job. Qu Yuan was very 5 at writing poems (诗). People still love his poems very much now. He was a 26 poet (诗人), but he was always 7 because the king didn't take his advice and it made his country lose many battles (战役). At last, he jumped into a 8 and died. It was the 9 day of the fifth lunar (农历) month that year. The Chinese people will never 10 Qu Yuan. They eat rice dumplings (粽子) and have dragon (龙) boat race in honor of (纪念) him every year. |
| ( )1. A. job ( )2. A. But ( )3. A. were off ( )4. A. got ( )5. A. good ( )6. A. usual ( )7. A. exciting ( )8. A. river ( )9. A. eight ( )10. A. forget | B. advice B. And B. stayed in the country B. lost B. hard B. happy B. sad B. mountain B. six B. remember | C. idea C. Then C. died C. wanted C. bad C. talented C. healthy C. town C. fifth C. study |