1.

The solubility in water of sulphate down the Be group is Be gt Mg gt Ca gt Sr gt Ba.

Answer»

HIGH heat of SOLVATION for smaller ions like `Be^(2+)`
Increasing molecular weight
Decreasing lattice energy
INCREASES in melting points

Solution :The hydration energy decreases from `Be^(+2)` to `BA^(+2)`. This causes the decreases in the solubilities of the sulphates in this ORDER. In other words, the solubilities decreases with increases in the ionic size.


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