JEE Main Chemistry question

Not in JEE Main or NEET syllabus

The solubility in water of sulphates of alkaline earth metals down the Be group is Be>Mg>Ca>Sr>Ba. This is due to:

(A)Increase in melting point
(B)High ionisation energy
(C)Hydration energy of the cation decreasing faster than the (nearly constant) lattice energy of the sulphateCorrect
(D)All of the above

Answer: (C)

Solution

The sulphate ion is large, so the lattice energy of changes relatively little down the group; but hydration energy of the cation falls sharply as ionic size increases from to . Since solubility depends on hydration energy outweighing lattice energy, and hydration energy drops faster than

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Question ID VK-138087