JEE Main Chemistry question

Not in JEE Main or NEET syllabus

The solubilities of carbonates of the magnesium group decrease down the group due to a decrease in:

(A)Inter-ionic attractions
(B)Entropy of solution formation
(C)Lattice energy
(D)Hydration energy of the cationCorrect

Answer: (D)

Solution

Lattice energy of these carbonates (with a relatively large anion) changes very little down the group, but hydration energy of the cation falls sharply as the cation grows larger, so the solubility-favouring hydration energy progressively fails to overcome the almost-constant lattice

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Question ID VK-138107