Which of the following compunds are readily soluble in water.?

(a) $B e S O_{4}$ (b) $M g S O_{4}$ (c) $B a S O_{4}$ (d) $S r S O_{4}$

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Solution

Answers: (a) $B e S O_{4}$ (b) $M g S O_{4}$

Solubility fo sulphates of alkaline earth metals in water decrease from $B e t o B a$ . $B e S O_{4}$ are fairly soluble while $B a S O_{4}$ is almost completely insoluble.
The decreasing solubility of $B e S O_{4}$ to $B a S O_{4}$ can be explained on the basis of decreasing hydration energy from $B e^{2 +}$ (as size increases). For $B e S O_{4}$ and $M g S O_{4}$ Hydration energy is more than lattice energy and so they are readily soluble.

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