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Among the sulphates of alkaline earth metals given below, which one has hydration enthalpy greater than lattice enthalpy?

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

Correct answer: BeSO4

Solution

BeSO4 has a higher hydration enthalpy than its lattice enthalpy due to the small size and high charge density of beryllium ions, which allows for stronger interactions with water molecules, thus favoring solubility.

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