现有碳酸钠、氧氧化钠、硫酸、氯化镁、硝酸钡5种浓溶液,将它们

现有碳酸钠、氧氧化钠、硫酸、氯化镁、硝酸钡5种浓溶液,将它们两两相互混合后,能发生反应的物质有        组,共产生______种白色沉淀。

答案

6  4

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