Q57 / 225 · JEE Main 2003 · Chemistry

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

Correct answer
A
hydration energies of cations
B
inter-ionic attraction
C
entropy of solution formation
D
lattice energies of solids

Solution

The solubility is governed by $\Delta \mathrm{H}_{\text {solution }}$ i.e. $\Delta \mathrm{H}_{\text {solution }}=\Delta \mathrm{H}_{\text {lattice }}-\Delta \mathrm{H}_{\text {Hydration }}$. Due to increase in size the magnitude of hydration energy decresaes and hence the solubility.

Hence, the correct answer is option: 'A'.

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