Identify the correct statements regarding the hydration enthalpies of s-block ions. — s Block Elements Chemistry Question

💡 Solution & Explanation

Hydration energy is inversely proportional to ionic size, so it decreases down the group. $Li^+$ is the smallest and has maximum hydration. Alkaline earth metals have higher charge density ($+2$ charge, smaller radius), yielding hydration energies 4-5 times higher. Because of high hydration energy, magnesium chloride exists as a hydrated salt ($MgCl_2 \cdot 6H_2O$ or $8H_2O$), making option D incorrect.