Chemistry - Complete s-block Question with Solution | TestHub

On moving down the group size of cation increases so hydration energy decreases and solubility decreases as lattice energy dominates over hydration energy.
Due to very small size of$\mathrm{M}{\mathrm{g}}^{+2},\mathrm{M}{\mathrm{g}}^{+2}$shows maximum hydration energy and$\mathrm{M}\mathrm{g}\mathrm{S}{\mathrm{O}}_4$is more soluble here.