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Per NCERT §5.5(d), the LATTICE ENTHALPY of an ionic compound is defined as the enthalpy change for which process?
ANa(s) → Na(g)
BOne mole of solid ionic compound → gaseous constituent ions, e.g. NaCl(s) → Na⁺(g) + Cl⁻(g); Δ_latt H° = +788 kJ/mol
CCl(g) + e⁻ → Cl⁻(g)
DNaCl(s) → Na(s) + Cl₂(g)
Answer & Solution
Correct answer: B. One mole of solid ionic compound → gaseous constituent ions, e.g. NaCl(s) → Na⁺(g) + Cl⁻(g); Δ_latt H° = +788 kJ/mol
Per NCERT §5.5(d), Δ_latt H°: NaCl(s) → Na⁺(g) + Cl⁻(g) = +788 kJ/mol. Determined via Born-Haber cycle (cannot be measured directly).
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