LiF is the least soluble among the fluorides of alkali metals because:
Correct answer: C. The lattice energy of LiF is quite high due to the smaller size of Li+ and F-
- A. The smaller size of Li+ imparts significant covalent character in LiF
- B. The hydration energies of Li+ and F- are quite high
- C. The lattice energy of LiF is quite high due to the smaller size of Li+ and F-
- D. LiF has a strong polymeric network in solid form
Explanation
Due to the very small ionic radii of both Li⁺ and F⁻, the electrostatic attraction between them is extremely strong. This results in a very high lattice energy, which is difficult for the hydration energy to overcome, making LiF sparingly soluble.
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