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【简答题】
某工业废水中仅含下表离子中的5种(不考虑水的电离及离子的水解)，且各种离子的物质的量浓度相等，均为0.1 mol/L。 甲同学欲探究废水的组成，进行了如下实验： Ⅰ.用铂丝蘸取少量溶液，在火焰上灼烧，无紫色火焰(透过蓝色钴玻璃观察)。 Ⅱ.取少量溶液，加入KSCN溶液无明显变化。 Ⅲ.另取溶液加入少量盐酸，有无色气体生成，该无色气体遇空气变成红棕色，此时溶液依然澄清，且溶液中阴离子种类不变。 Ⅳ. 向Ⅲ中所得的溶液中加入BaCl 2 溶液，有白色沉淀生成。 请推断： (1)由Ⅰ、Ⅱ判断，溶液中一定不含有的阳离子是__________(写离子符号)。 (2)Ⅲ中加入少量盐酸生成无色气体的离子方程式是_______________。 (3)将Ⅲ中所得红棕色气体通入水中，气体变无色，所发生反应的化学方程式为______________。 (4)甲同学最终确定原溶液中所含阳离子是________，阴离子是________。(写离子符号) (5)另取100 mL原溶液，加入足量的NaOH溶液，充分反应后过滤，洗涤，灼烧至恒重，得到的固体质量为________ g。 (6)工业废水中常含有不同类型的污染物，可采用不同的方法处理。以下是针对含不同污染物的废水提出的处理措施和方法，其中正确的是(　　)
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