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Which one is the correct statement with reference to solubility of MgSO4 in water?

1. SO4 2− ion mainly contributes towards hydration energy
2. Sizes of Mg2+ and SO4 2− are similar
3. Hydration energy of MgSO4 is higher in comparison to its lattice energy
4. Ionic potential (charge/radius ratio) of Mg2+ is very low

Correct answer: Hydration energy of MgSO4 is higher in comparison to its lattice energy

Solution

The solubility of MgSO4 in water is due to the hydration energy of Mg2+ and SO4 2− ions being higher than the lattice energy of the salt, which favors dissolution.

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