物质的量浓度相同的NaCl、MgCl2、AlCl3三种溶液,当溶液的体积比为3:2:

物质的量浓度相同的NaClMgCl2AlCl3三种溶液,当溶液的体积比为3:2:1时,三种溶液中Cl-的物质的量浓度之比为(   

A.1:1:1                B.1:2:3                C.3:2:1                 D.3:4:3

答案

B

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