A) hydration energies of cations
B) inter-ionic attraction
C) entropy of solution formation
D) lattice energies of solids
Correct Answer: A
Solution :
As we move down the group, the lattice energies of carbonates remain approximately the same. However, the hydration energies of the metal cation decreases from \[B{{e}^{2+}}\] to \[B{{a}^{2+}},\] hence the solubilities of carbonates of the alkaline earth metal decrease down the group mainly due to decreasing hydration energies of the cations from \[B{{e}^{2+}}\] to \[B{{a}^{2+}}\].
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