Chemistry - Complete s-block Question with Solution | TestHub
The solubility of an ionic compound depends upon lattice energy and hydration energy of that compound. Lattice energy involves the fact that how tightly are ions held together in ionic lattice whereas hydration energy involves the attraction of ions towards water molecule to get themselves hydrated. The dissolution occurs when hydration energy predominates over lattice energy. The solubility also depends upon this difference. More is more is solubility.
Report the correct order for lattice energy :
Options:
Answer:
Solution:
The correct option is (A) BeO > MgO > CaO.
Lattice energy is inversely proportional to the size of the ions when ionic charges remain constant. In BeO, MgO, and CaO, all cations and anions carry the same +2 and -2 charges.
Down the alkaline earth metal group, the size of the cations increases in the order: Be²⁺ < Mg²⁺ < Ca²⁺.
Smaller ionic size results in a shorter interionic distance, leading to a stronger electrostatic attraction and higher lattice energy.
