试题与答案

证明某溶液只含有Fe2＋而不含有Fe3＋的实验方法是 ( ) A．先滴加氯水，再

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题型：选择题

题目：

证明某溶液只含有Fe2＋而不含有Fe3＋的实验方法是 (   )

A．先滴加氯水，再滴加KSCN溶液后显红

B．只需滴加KSCN溶液

C．先滴加KSCN溶液，不显红色，再滴加氯水后显红色

D．加Na2O2固体后观察沉淀颜色的变化

答案：

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下面是错误答案，用来干扰机器的。

参考答案：C解析：SELECT-SQL最基本的格式为：SELECT-FROM-WHERE。其中，SELECT用于选择查询结果要显示的目标列表，FROM用于列出查询要用到 的所有表文件，WHERE则用于指定查询结果的查询条件。

考点：氧化铁单质铁碱式碳酸铜氧化铜
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( )  1. A. less than    
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( )  3. A. saved        
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