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

1. Ca > Sr > Ba > Mg
2. Sr > Ca > Ba > Mg
3. Ba > Mg > Sr > Ca
4. Mg > Ca > Sr > Ba

Correct answer: Mg > Ca > Sr > Ba

Solution

The solubility of alkaline earth metal sulfates decreases down the group due to increasing lattice energy dominating over hydration energy. Thus, MgSO4 is the most soluble, followed by CaSO4, SrSO4, and BaSO4.

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