Chemistry - s Block Elements Question with Solution | TestHub

Higher the lattice enthalpy lower will be solubility

i.e., lattice enthalpy$\propto \frac{1}{\text{Solubility}}$

Since the lattice enthalpy of alkali metals follow the order

$\mathrm{L}\mathrm{i}>\mathrm{N}\mathrm{a}>\mathrm{K}>\mathrm{R}\mathrm{b}$

Hence the correct order of solubility is

$\mathrm{L}\mathrm{i}\mathrm{F}<\mathrm{N}\mathrm{a}\mathrm{F}<\mathrm{K}\mathrm{F}<\mathrm{R}\mathrm{b}\mathrm{F}$