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【题目】常温常压下,下列各组气体不能共存的是( )

A.SO2与O2 B.NO2与NO

C.O2与N2 D.NO与O2

【答案】D

【解析】常温常压下两种气体不发生反应就可共存。A项,SO2与O2需在加热和催化剂条件下才发生反应,常温常压下能共存;B项,NO2和NO不反应可共存;C项,N2和O2需在放电或高温下才反应,常温常压下可共存;D项,常温常压下,NO与O2迅速反应生成NO2,不能共存。

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