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 in the group because solubility product decreases from\[BeS{{O}_{4}}\]to\[BaS{{O}_{4}}\]. Hence, the order of solubility of their sulphates is: Sulphate: \[BeS{{O}_{4}}>MgS{{O}_{4}}>CaS{{O}_{4}}>SrS{{O}_{4}}>BaS{{O}_{4}}\] \[{{K}_{sp}}:\,\,\,\,\,\,\,\,\,very\text{ }high\,\,\,\,\,\,\,10\,\,\,\,\,\,\,\,2.4\times {{10}^{-5}}\,\,\,\,\,\,7.6\times {{10}^{-7}}\,\,\,\,\,\,\,1.5\times {{10}^{-9}}\]
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