金属加工后的废切削液中含质量分数为2%~5%的NaNO2,它是一种环境污

金属加工后的废切削液中含质量分数为2%5%NaNO2,它是一种环境污染物。人们用NH4Cl溶液来处理此废切削液,使NaNO2转化为无毒物质,该反应分两步进行:

第一步:NaNO2NH4Cl===NaClNH4NO2;第二步:NH4NO2===N2↑+2H2O

下列对第二步反应的叙述中,正确的是( 

NH4NO2是氧化剂;②NH4NO2是还原剂;③NH4NO2发生了分解反应;④只有氮元素的化合价发生了变化;⑤NH4NO2既是氧化剂又是还原剂。

A.①③    B.①④      C.②③④     D.③④⑤

答案

D

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