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Which of the following alkaline earth metal sulphates has hydration enthalpy higher than the lattice enthalpy?

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 outweighs its lattice enthalpy, making it highly soluble in water.

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