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Per NCERT §4.2, for NaCl formation: IE(Na) = +496 kJ/mol, ΔₑgH(Cl) = −349 kJ/mol — these alone are positive (+147 kJ/mol). What makes the overall process favourable?
ANegative bond energy of Cl₂
BElectron mass difference
CNegative ionisation energy of Cl
DThe lattice enthalpy of NaCl (−788 kJ/mol) more than compensates the +147
Answer & Solution
Correct answer: D. The lattice enthalpy of NaCl (−788 kJ/mol) more than compensates the +147
Per NCERT §4.2, IE + EGH sum = +147 kJ/mol but lattice formation releases 788 kJ/mol → net exothermic ⇒ ionic bond stable.
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