The low solubility of LiF and CsI in water is due to respectively

Options

A. low lattice enthalpy, high hydration enthalpy
B. high hydration enthalpy, low lattice enthalpy
C. low hydration enthalpy, low lattice enthalpy
D. high lattice enthalpy, low hydration enthalpy.

Answer

D

Explanation

Hydration energy of Li is highest thus its solubility should be very high but small `Li^(+)` and `F^(-)` ions interact very strongly resulting in high lattice energy of LiF which is responsible for its insolubility.
CsI is insoluble due to low hydration energy of `Cs^(+)`.