将铜粉放入稀硫酸中,加热无明显现象发生。但加入某盐后,发现铜

将铜粉放入稀硫酸中,加热无明显现象发生。但加入某盐后,发现铜粉质量逐渐减少,该盐可能是

A.Fe2(SO4)3             B.ZnSO4                C.KNO3             D.NaCl

答案

AC 

解析:Fe2(SO4)3会与铜粉反应生成硫酸亚铁和硫酸铜。加入KNO3后,在H+条件下具有强氧化性,能把铜氧化为硝酸铜。

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