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Q. The correct order of solubility of the sulphates of alkaline earth metals in water is $Be > Mg > Ca > Sr > Ba$. This is due to

JIPMERJIPMER 2014The s-Block Elements

Solution:

As we move down the group from $BeSO_4$ to $BaSO_4$, the enthalpy of hydration of the positive ion becomes smaller due to increase in ionic size. Salts of heavier metal ions are less soluble than those of lighter ions.