Among the following, the compound that is readily soluble in water is

Solubility order:⟶BeSO4>MgSO4>CaSO4>SrSO4>BaSO4As hydration energy decreases solubility decreasesIf anion size is large   SO4−2,CO3−2 then with small change in cation size there is no coniderable change in lattice energy then the solubility depends on the hydration energy i.e., here hydration energy dominating factor over lattice energyWith increase in size of cation hydration energy decreases and hence solubility decrerases.Hydration energy ∝ solubilityBeSO4 readily soluble in waterWhere as as BaSO4 is least soluble in water