【題目】下列關(guān)于 NO2 H2O反應(yīng)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(yīng),生成了硝酸與一氧化氮,氮的化合價(jià)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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