题目内容：

欲除去不纯物质中的杂质（括号内为杂质），所选试剂正确的是（　　）

 选项                                                   待提纯物质                                      选用试剂

 A                                                         NaNO₃溶液（NaCl）                      过量硝酸银溶液

 B                                                         NaCl溶液（CuCl₂）                        适量氢氧化钠溶液

 C                                                         盐酸（硫酸）                                  硝酸钡溶液

 D                                                         Fe粉（Cu粉）                                稀硫酸