MCQ practice · SSC Chemistry Board questions · Chapter 8: Chemistry and Energy
Which has the highest bond energy?
Think it through first, then pick an option.
- a H₂
- b N₂
- c O₂
- d Cl₂
Answer and explanation
Correct answer: b N₂
N₂ has the triple bond N≡N, 946 kJ/mol, the largest in the table.
Why the other options are wrong
- a H₂: H-H is 436 kJ/mol, far below N≡N at 946.
- c O₂: O=O is 498 kJ/mol; a double bond, but still below N≡N at 946.
- d Cl₂: Cl-Cl is only 244 kJ/mol, the weakest here.
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