题目

物质的量浓度之比为3:2:1的NaCl、MgCl2、AlCl3三种溶液,当他们的体积相同时,三种溶液中Cl-离子的物质的量浓度之比是( )A.3:4:3 B.1:2:3 C.3:2:1 D.1:1:1 答案:【答案】A【解析】NaCl、MgCl2、AlCl3三种溶液的物质的量浓度之比为3:2:1,设NaCl、MgCl2、AlCl3的浓度分别为3mol/L、2mol/L、1mol/L,则NaCl溶液中Cl-浓度为3mol/L、MgCl2溶液中Cl-浓度为4mol/L、AlCl3溶液中Cl-浓度为3mol/L,则NaCl、MgCl2、AlCl3三种溶液中Cl-离子的物质的量浓度之比是3:4:3;答案选A。—I can't help but feel very ________ about the matter. Linda, my dear, tell me the truth.—Oh, Mum, there is nothing between Tom and me.A.particularB.lonelyC.anxiousD.concerned
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