The hydration energy of Mg2+ is less than:
Correct answer: D. Al3+
- A. Na+
- B. Ca2+
- C. Li+
- D. Al3+
Explanation
The hydration energy is the energy released when a gaseous ion is dissolved in excess water to form an infinitely dilute solution. It is always exothermic because heat is liberated when attractive bonds form between water molecules and the ions. Hydration energy is directly proportional to the charge density, so an ion with the greatest magnitude of charge and smallest radius will have the highest hydration enthalpy. Al3+ has a charge greater than Mg2+ and a radius slightly smaller than it, therefore it has a greater value of hydration energy and hence, the correct answer is D.
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