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

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CaSO4

BeSO4

BaSO4

SrSO4

answer is B.

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Detailed Solution

Hydration energy decreases solubility decreasesHydration energy ∞ solubilityIn case of large size anion with small charge in cation size there is no considerable change in lattice energy and hence in this case solubility depends on the hydration energyHint :In general in all IA group and IIA group compounds except fluorides and hydroxides solubility down the group decreasesBut the two exception are carbonates and bicarbonate of IA group where solubility increases BeSO4 is highly soluble in water

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