下图表示治理汽车尾气所涉及反应的微观过程。下列说法不正确的是

下图表示治理汽车尾气所涉及反应的微观过程。下列说法不正确的是（）

A、图中单质的化学式为N₂ B、该反应使有毒气体转化为无毒气体

C、反应物都属于氧化物 D、反应中原子、分子个数都不变

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