Among the sulphates of alkaline earth metals,
Question:

Among the sulphates of alkaline earth metals, the solubilities of $\mathrm{BeSO}_{4}$ and $\mathrm{MgSO}_{4}$ in water, respectively, are :

1. poor and poor

2. high and poor

3. high and high

4. poor and high

Correct Option:

Solution:

$\mathrm{BeSO}_{4}$ and $\mathrm{MgSO}_{4}$ are readily soluble in water due to greater hydration enthalpies of $\mathrm{Be}^{2+}$ and $\mathrm{Mg}^{2+}$ ions, dominate over their lattice enthalpies and therefore their sulphates are highly soluble.