题目内容

【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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