问题 选择题

某溶液中大量存在四种离子:NO-3、SO2-4、H+、M,其物质的量之比为:N(NO-3):n(SO2-4):n(H+):n(M)=3:1:3:1,则M可能为                                                              (   )

①Fe2+                                                                ②Mg2+                                                ③Cl                                                   ④Ba2+

A.①②④

B.③

C.②

D.①②

答案

答案:C

单项选择题
单项选择题