Which of the following pairs consists of only network solids?

Many ionic crystals dissolve in water because

Which of the following exhibits the weakest intermolecular forces?

The lattice enthalpy of an ionic compound is the enthalpy change when one mole of an ionic compound in its solid state dissociates into its ions in the gaseous state. It is impossible to determine it directly by experiment. Suggest and explain an indirect method to measure the lattice enthalpy of $NaCl_{(s)}$.

From the following,which compound on heating readily sublimes?

Which set of compounds in the following pairs of ionic compounds has the higher lattice energy?
$(i) \, KCl$ and $MgO$
$(ii) \, LiF$ and $LiBr$
$(iii) \, Mg_3N_2$ and $NaCl$