【題目】下列關于 NO2跟 H2O反應的說法中，正確的是( )。

A．NO2只作氧化劑 B．NO2只作還原劑

C．NO2既作氧化劑，又作還原劑 D．NO2既不作氧化劑，又不作還原劑

【答案】C

【解析】二氧化氮與水反應，生成了硝酸與一氧化氮，氮的化合價既有升高，也有降低，二氧化氮既是氧化劑，又是還原劑。。

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