Question: beo is almost insoluble but beso4?
Answer: (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. ... in BaSO4 , Lattice energy predominates over hydration energy so, it is insoluble in water.