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

lattice energies of solids

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hydration energies of cations

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interionic attractions

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entropy of solution formation

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Solution

The correct option is D hydration energies of cations
Hydration energy is inversely proportional to the size of cation, so as size of cation increases, hydration energy decreases and because of that solubility decreases.

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