A) \[CaS{{O}_{4}}\]
B) \[BeS{{O}_{4}}\]
C) \[BaS{{O}_{4}}\]
D) \[SrS{{O}_{4}}\]
Correct Answer: B
Solution :
Key Idea Hydration energy varies inversely with size and in sulphates of alkaline earth metals lattice energy remains almost constant. The order of size of alkaline earth metals is \[B{{e}^{2+}}<C{{a}^{2+}}<S{{r}^{2+}}<B{{a}^{2+}}\] Thus, the order of hydration energy is \[B{{e}^{2+}}>C{{a}^{2+}}>S{{r}^{2+}}>B{{a}^{2+}}\] Hence, \[BeS{{O}_{4}}\]has the hydration enthalpy higher than the lattice enthalpy.
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