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Which of the following statements about lattice enthalpy is correct?
AIt is the energy required to convert one mole of solid into a liquid
BIt is the energy required to remove an electron from the atom
CIt is the energy required to completely separate one mole of a solid ionic compound into gaseous constituent ions
DIt is the energy released when an ion is solvated by water
Answer & Solution
Correct answer: C. It is the energy required to completely separate one mole of a solid ionic compound into gaseous constituent ions
Lattice enthalpy is the energy required to **fully separate 1 mol of an ionic solid into its gaseous ions** (e.g., NaCl(s) → Na⁺(g) + Cl⁻(g); ΔH = 788 kJ mol⁻¹).
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