A) \[~Be>Ca>Mg>Ba>Sr\]
B) \[~Mg>Be>Ba>Ca>Sr\]
C) \[Be>Mg>Ca>Sr>Ba\]
D) \[Mg>Ca>Ba>Be>Sr\]
Correct Answer: C
Solution :
The solubility of sulphates of alkaline earth metals decreases regularly on moving down the group because solubility product decreases from \[\text{BeS}{{\text{O}}_{\text{4}}}\]to \[\text{BaS}{{\text{O}}_{\text{4}}}\]Hence, the order of solubility of their sulphates is \[\underset{{{K}_{sp}}:\,\text{very}\,\text{high}}{\mathop{BeS{{O}_{4}}}}\,>\underset{10}{\mathop{MgS{{O}_{4}}}}\,>\underset{2.4\,\times \,{{10}^{-5}}}{\mathop{CaS{{O}_{4}}}}\,>\underset{7.6\,\times \,{{10}^{-7}}}{\mathop{SrS{{O}_{4}}}}\,>\underset{1.5\,\times \,{{10}^{-9}}}{\mathop{BaS{{O}_{4}}}}\,\]
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