Which one of the following alkaline earth metal sulphates has its hydration enthalpy greater than its lattice enthalpy

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Which one of the following alkaline earth metal sulphates has its hydration enthalpy greater than its lattice enthalpy?

1. BeSO₄
2. CaSO₄
3. SrSO₄
4. BaSO₄

Answer

Because of smallest size of Be²⁺, its hydration energy is maximum and is greater than the lattice energy of BeSO₄.

The correct option is A.