Select the correct statement about lattice energy:
Correct answer: B. The energy liberated when 1 mole of an ionic crystal lattice is formed from its constituent ions in the gaseous state.
- A. The energy absorbed when 1 mole of an ionic crystal lattice is formed from its constituent ions in the gaseous state.
- B. The energy liberated when 1 mole of an ionic crystal lattice is formed from its constituent ions in the gaseous state.
- C. The energy liberated when 1 mole of an ionic crystal lattice is split into its constituent ions in the gaseous state.
- D. None of the above
Explanation
Lattice energy refers to the energy change associated with the formation of an ionic solid from its gaseous ions. This process is exothermic, meaning it releases energy. Option B is correct because it accurately describes the process of lattice formation as one that liberates energy. Option A is incorrect because it suggests that energy is absorbed, which describes an endothermic process. Option C is incorrect because it describes the reverse process, where energy would be absorbed to break the lattice apart. Option D is also incorrect because it suggests none of the statements are true, while Option B is accurate.
This question appeared on the ETEA MDCAT 2012 paper, which you can sit online with every answer explained.
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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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