Which alkaline earth metal sulphates have the highest solubility in water?

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Solution

Beryllium sulphate and magnesium sulphate are highly soluble in water due to high hydration energy of small cations Be²⁺ and Mg²⁺.As the size of cations increases down the group, the hydration energy decreases and thus solubility of sulphates decreases.

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Solubility of alkaline earth metal sulphates in water decreases in the sequence:

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