Which of the following possesses maximum hydration energy ?
Correct answer: C. Mg+2
- A. Na+
- B. K+
- C. Mg+2
- D. Ca+2
Explanation
Mg2+ has the maximum hydration energy because its double positive charge is concentrated in a relatively small ion, producing the strongest attraction to polar water molecules. The likely mistake is Na+, or Ca2+ because it also has a 2+ charge, but Mg2+ has the greater charge density and therefore stronger hydration.
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About Lattice Energy
Lattice energy describes the energy released when gaseous ions form one mole of an ionic solid, or the energy required to separate that solid into gaseous ions, depending on the convention used. Its value depends mainly on ionic charge and radius and is calculated through Born-Haber cycles.
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