JEE Main Chemistry question

Not in JEE Main or NEET syllabus

The solubilities of carbonates decrease down the magnesium group due to decrease in [UP SEE 2007, MP PET 2007]

(A)Lattice energies of solids
(B)Hydration energies of cationsCorrect
(C)Interionic attraction
(D)Entropy of solution formation

Answer: (B)

Solution

Lattice energies of the group 2 carbonates change only slightly down the group (the carbonate ion is relatively large, so cation size variation has limited effect on lattice energy), while hydration energy of the cation falls off sharply as the cation becomes larger.

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Question ID VK-137651