等体积的NaCl、MgCl2、AlCl3三种溶液分别与等体积等物质和量浓度的AgNO

等体积的NaClMgCl2AlCl3三种溶液分别与等体积等物质和量浓度的AgNO3溶液恰好完全反应,则NaClMgCl2AlCl3三种溶液的物质的量浓度之比是

A1:2:3             B3:2:1            C6:3:2           D1:1:1

答案

C

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