15. (99-6-88) Sulfat ion bilan eriydigan va karbonat ion bilan erimaydigan tuzlar hosil qiladigan ionlarni tanlang:
1) magniy; 2) temir (II); 3) rux; 4) bariy;
5) natriy; 6) ammoniy; 7) marganes (II).
A) 1,2, 4, 7 B)1,3, 6, 7
C) 4, 5, 6, 7
D) 1, 2, 3, 7
E) 3, 4, 6, 7