A) \[BaS{{O}_{4}}~\]
B) \[MgS{{O}_{4}}~\]
C) \[SrS{{O}_{4}}\]
D) \[CaS{{O}_{4}}\]
Correct Answer: A
Solution :
The solubility of the alkaline earth metal sulphates in Water decreases down the group, because of the decrease in hydration energy due to increase in atomic size ie, \[Be>Mg>>Ca>Sr>Ba\]. Remember, in case of sulphates of alkaline earth metals lattice energy remains almost constant as the size of metal increases, thus solubility is decided only by hydration energy. Hence, \[BaS{{O}_{4}}\]is least soluble in water.
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