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In which of the following the hydration energy is higher than the lattice energy?

1. MgSO4
2. BaSO4
3. SrSO4
4. CaSO4

Correct answer: MgSO4

Solution

Hydration energy decreases down the group as ionic size increases, while lattice energy also decreases but at a slower rate. MgSO4 has the smallest cation, leading to higher hydration energy compared to its lattice energy.

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