Beo is insoluble but beso4 is soluble in water

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Question 10.29 How would you explain the following observations?

(i) BeO is almost insoluble but BeSO4 in soluble in water,
(ii) BaO is soluble but BaSO4 is insoluble in water,
(iii) LiI is more soluble than KI in ethanol.
Class XI The s-Block Elements Page 306

Answered by admin @



(i) Lattice energy of BeO is greater than its hydration energy so, it is insoluble in water while in case of BeSO4 , hydration energy is greater than lattice energy, so, it is readily soluble in water.

(ii) Lattice energy of BaO is much smaller than that of its hydration energy, so it is soluble in water .in BaSO4 , Lattice energy predominates over hydration energy so, it is insoluble in water.

(iii) according to Fazan's rule , covalent characters on LI is more than KI . and we know , covalent compound is soluble in covalent compound very easily.
that's why LiI is more soluble than KI in ethanol(covalent compound).






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