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Answer» On decreasingdown the group, the lattice energy as WELL as hydration energy decreases
Only `BeF_(2)` is soluble whereas `MgF_(2),CaF_(2),SrF_(2)` and `BaF_(2)` are insoluble
`BeCl_(2)` is insoluble whereas `MgCl_2,CaCl_(2),SrCl_(2)` and `BaCl_(2)` are soluble
`BeSO_(4)` is soluble whereas `BsO_(4)` is insoluble Solution :The lattice energy and hydration energy decreases down the group. `BeF_(2)` has a high hydration energy wheras SALTS `MgF_(2), CaF_(2),SrF_(2)` and `BaF_(2)` are insoluble because for these, the hydration energy is not able to compensate the lattice energy. `BeCl_(2)` is COVALENT hence insoluble in water. while `MgCl_(2),CaCl_(2),SrCl_(2)` and `BaCl_(2)` are ionic and are soluble in water through their solubility decreases down the group. `BeSO_(4)` is soluble due to the high hydration energy of `Be^(2+)` whereas hydration energy decreases down the group and the hydration energy is not able to compensate for the high lattice energy.
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