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Which one of the following alkaline earth metal sulphates has its hydration enthalpy greater than its lattice enthalpy? (1) CaSO4 (2) BeSO4 (3) BaSO4 (4) SrSO4

1. CaSO4
2. BeSO4
3. BaSO4
4. SrSO4

Correct answer: BeSO4

Solution

BeSO4 has a high hydration enthalpy due to the small size and high charge density of the Be2+ ion, which allows it to interact strongly with water molecules. This strong interaction results in a hydration enthalpy that exceeds the lattice enthalpy, making it unique among the alkaline earth metal sulfates.

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