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The solubilities of sulphates of alkaline earth metals decrease from Be to Ba because

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(A) Their lattice energies decrease in this order

(B) Their covalent character increase in this order

(C) Lattice energies are about the same

(D) Hydration energies of Be2+ to Ba2+ cations decrease in this order

Ans. D

Sol. Solubility of salt is function of lattice energy and hydration energy. For maximum solubility of salt hydration energy should be high and lattice energy should be low.

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