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Which one of the following alkaline earth metal sulphates has its hydration enthalpy greater than its lattice enthalpy?
A. `SrSO_4`
B. `CaSO_4`
C. `BeSO_4`
D. `BaSO_4`

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Correct Answer - C
Among alkaline earth metals, lattice enthalpy remain almost constant but hydration enthalpy decrease down the group. Thus `BaSO_4` has higher hydration enthalpy as compared to lattice energy. Thus `BaSO_4` has higher hydration energy as compared lattice energy.

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