A.Ca2+〈K+〈S2- B.Na+〉Mg2+〉A(chǔ)l3+ C.Ne〉N3-〉Br- D.N3-〉O2-〉F-
A.[HgCl]+ B.[HgCl2] C.[HgCl3]- D.[HgCl4]2-
A.0.4mol B.1.0mol C.2.0mol D.2.5mol