Question

Which of the following statement gives the correct explanation of the fact that solubility of alkali metal fluorides increases down the group?

• A. Hydration energy increases and lattice energy decreases down the group.
• B. Both energy decrease down the group but decrease in hydration energy is rapid.
• C. Both energy decrease down the group but decrease in lattice energy is more.
• D. Both energy increase down the group but increase in hydration energy is rapid.

Answer 1

The correct option is C Both energy decrease down the group but decrease in lattice energy is more.

Although both hydration and lattice energies of alkali metal fluorides decreases down the group and hydration energy dominates over lattice energy, therefore, solubility increases down the group.