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The solubility and the hydration energy of sulphates of alkaline earth metals decreases as we move down the group from Be to Ba due to the reason that ionic size increases down the group. The lattice energy remains constant because sulphate ion is so large, so that small change in cationic sizes do not make any difference. Thus the order will be: BeSO₄ > MgSO₄ > CaSO₄ > SrSO₄ > BaSO₄.

1. BeSO₄
2. MgSO₄
3. CaSO₄
4. SrSO₄

Correct answer: BeSO₄

Solution

The solubility of sulphates decreases down the group due to decreasing hydration energy, which outweighs the nearly constant lattice energy. BeSO₄, being the smallest cation, has the highest hydration energy and thus the highest solubility.

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