The solubility of carbonates decreases down the magnesium group due to a decrease in

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inter-ionic attration

hydration energy of cations

lattice energy of solids

entropy of solution formation

answer is A.

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Detailed Solution

As we move down the group, the lattice energy of carbonates remains approximately the same. However, the hydration energy of the metal cations decrease from Be²⁺ to Ba²⁺ , hence the solubility of carbonates of the alkaline earth metals decreases down the group mainly due to decreasing hydration energy of the cations from Be²⁺ to Ba²⁺

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