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The bond dissociation enthalpy of N₂ is approximately 946 kJ mol⁻¹ while that of O₂ is 498 kJ mol⁻¹. This is primarily because:
AN₂ has a triple bond (bond order 3) whereas O₂ has a double bond (bond order 2)
BN₂ is a diatomic gas, O₂ is not
CN is more electronegative than O
DO₂ is paramagnetic
Answer & Solution
Correct answer: A. N₂ has a triple bond (bond order 3) whereas O₂ has a double bond (bond order 2)
Higher bond order → stronger bond. **N₂ (bond order 3)** is much stronger than O₂ (bond order 2) — making N₂ one of the most inert diatomic molecules.
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