MCQ practice · SSC Chemistry Board questions · Chapter 7: Chemical Reactions
What is ΔH (kJ/mole) for the reaction N₂(g) + O₂(g) → 2NO(g)?
Think it through first, then pick an option.
- a 180
- b - 192
- c - 176.8
- d 92
Answer and explanation
Correct answer: a 180
Making NO absorbs 180 kJ, so ΔH = +180 kJ.
Why the other options are wrong
- b - 192: The book has no such value; the reaction is endothermic with ΔH = +180 kJ.
- c - 176.8: A negative value means exothermic; making NO absorbs heat, ΔH = +180.
- d 92: 92 kJ is the heat for ammonia; for NO it is 180.
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