Which of the following alkaline earth metal sulphates possesses a hydration enthalpy that is strictl — s Block Elements Chemistry Question
Question
Which of the following alkaline earth metal sulphates possesses a hydration enthalpy that is strictly higher than its lattice enthalpy, making it highly soluble in water?
Answer: D
💡 Solution & Explanation
Beryllium has the smallest ionic size among Group 2 elements, yielding an exceptionally high hydration enthalpy for the $Be^{2+}$ ion. This hydration enthalpy is large enough to completely overcome the lattice enthalpy of the sulphate crystal, making $BeSO_4$ highly soluble in water.
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