Solve. ternary ionic compounds - polyatomic ions?

1.Rb2SO4, 2. Ca(NO2)2, 3. MgCO3, 4. NaC2H3O2, 5. NH4Br, 6. Fr(OH)3, 7. Mn(NO3)3, 8. Pb(CN)4, 9. Au2(SO4)3, 10. magnesium hydroxide, 11. aluminum nitrite, 12. potium phosphate, 13. lithium sulfate, 14. iron (III) nitrite, 15. tin (IV) hydroxide, 16. ammonium nitrite, 17. sodium cyanide, 42. colbalt (II) chlorate