The lattice energy of an ionic compound depends on which of the following?

Sodium sulphate is soluble in water but barium sulphate is insoluble because:

If the enthalpy of sublimation of $Li$ is $155 \ kJ \ mol^{-1}$,enthalpy of dissociation of $F_2$ is $150 \ kJ \ mol^{-1}$,ionization enthalpy of $Li$ is $520 \ kJ \ mol^{-1}$,electron gain enthalpy of $F$ is $-313 \ kJ \ mol^{-1}$,and standard enthalpy of formation of $LiF$ is $-594 \ kJ \ mol^{-1}$,then the magnitude of the lattice enthalpy of $LiF$ is . . . . . . $kJ \ mol^{-1}$ (nearest integer).

Arrange the bonds in order of increasing ionic character in the molecules: $LiF$,$K_{2}O$,$N_{2}$,$SO_{2}$ and $ClF_{3}$

Which of the following has the strongest bond?

The force which holds atoms together in an electrovalent bond is