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

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

Correct answer: BeSO4

Solution

BeSO4 has a higher hydration enthalpy compared to its lattice enthalpy due to the small size and high charge density of the beryllium ion, which allows for stronger interactions with water molecules, leading to greater stabilization upon hydration.

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