下列实验中金属或氧化物可以完全溶解的是 A.1 mol铜片与含2 mol H2SO4

下列实验中金属或氧化物可以完全溶解的是

A.1 mol铜片与含2 mol H2SO4的浓硫酸共热

B.1 mol MnO2粉末与含2 mol H2O2的溶液共热

C.常温下1 mol铝片投入足量的浓硫酸中

D.常温下1 mol铜片投入含4 mol HNO3的浓硝酸中

答案

D 


解析:

A项Cu与浓H2SO4反应,但随反应的进行,溶液变稀,Cu有剩余,B项MnO2为H2O2分解的催化剂,C项Al在常温下,在浓硫酸中钝化;D项Cu+4HNO3(浓)===Cu(NO3)2+2NO2↑+2H2O,尽管n(Cu)∶n(HNO3)=1∶4,但随反应的进行,浓HNO3变稀,则发生反应3Cu+8HNO3(稀)===3Cu(NO3)2+2NO↑+4H2O,此时n(Cu)∶n(HNO3)=3∶8>1∶4,即HNO3仍有剩余,Cu完全溶解。

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