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【单选题】
某化学兴趣小组欲研究H 2 SO 4 、NaCl、KCl、Na 2 CO 3 、FeCl 3 、NaOH的性质，对于如何研究，他们设计了两种研究方案： 方案1：将它们按照酸、碱、盐分类，然后分别溶于水得到溶液，进行实验． 方案2：将它们按照钠盐、钾盐、铁盐和其他化合物分类，然后分别溶于水得到溶液，进行实验． 下列说法正确的是（　　）
A.
按照方案1属于碱的有Na 2 CO 3 、NaOH
B.
按照方案2属于钠盐的有NaCl、Na 2 CO 3 、NaOH
C.
方案1中的碱与方案2中的铁盐反应可得到一种红褐色胶体
D.
设计方案2的同学取某种溶液，在其中加入上述溶液中的钾盐溶液有白色沉淀产生，加入稀硝酸沉淀不消失，则该溶液中一定含有Ag +
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A.
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A.
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B.
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C.
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C.
their secret weapon
D.
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A.
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