在化学反应MnO2+4HClMnCl2+2H2O+Cl2↑中,四种元素的化合价在化学反

在化学反应MnO2+4HClMnCl2+2H2O+Cl2↑中,四种元素的化合价在化学反应前后降低的是
A.MnB.OC.HD.Cl

答案

A解析:

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