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Per NCERT §5.5(d), the BORN-HABER cycle for NaCl uses Hess's law and includes which steps?
AOnly enthalpy of formation
BJust IE of Na
COnly combustion
DSublimation of Na(s), ionisation of Na(g), dissociation of ½Cl₂(g), electron-gain of Cl(g), and lattice formation
Answer & Solution
Correct answer: D. Sublimation of Na(s), ionisation of Na(g), dissociation of ½Cl₂(g), electron-gain of Cl(g), and lattice formation
Per NCERT §5.5(d), Born-Haber: Δ_sub H° + IE + ½ Δ_bond H° + Δ_eg H° + Δ_latt H° = Δ_f H°. For NaCl: 108.4 + 496 + 121 − 348.6 − 788 = −411.2 (matches Δ_f H°).
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