Which of the following is the correct systematic name for the complex compound [ extCo( exten)2 extCl2] extNO3?

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18. The sulphates and carbonates of Mg, Ca, and Sr are insoluble or sparingly soluble in water because

• B) their lattice energies are higher than their hydration energies of their ions

19. Raoult's law states that

• D) The partial vapour pressure of a component in a liquid mixture is the product of its mole fraction and its pure vapour pressure

20. Why is it that lithium is the only metal in group I of the periodic table without a 4th ionization energy?

• C) It has only three electrons in its atoms

21. The correct systematic name for the complex compound $[\text{Co}(\text{en})_2\text{Cl}_2]\text{NO}_3$ is:

• D) Dichlorobisethylenediaminecobalt(III)nitrate