题干

除去下表内各物质中含有的少量杂质,写出除杂试剂,并填写分离方法.

序号

物质

杂质

所加试剂

分离方法

(1)

NO

NO2



(2)

Fe粉

Al粉



(3)

氯化钠固体

氯化铵固体

/


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答案(点此获取答案解析)

解:(1)NO2能和水反应生成NO,故可以用水洗气以除去NO中的NO2

(2)Al既能和酸反应又能和碱反应,而Fe只能和酸反应,故可以用氢氧化钠溶液除去铁中的铝;

(3)氯化钠受热不分解,而氯化铵受热易分解,故可以用加热的方法来除去氯化钠中的氯化铵.

故答案为:

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