MCQ practice · SSC Chemistry Board questions · Chapter 7: Chemical Reactions
N₂(g) + O₂(g) ⇌ 2NO(g); ΔH = +180 kJ. Which have an effect on this reaction?
- i. concentration
- ii. heat
- iii. pressure
Think it through first, then pick an option.
- a i and ii
- b i and iii
- c ii and iii
- d i, ii and iii
Answer and explanation
Correct answer: a i and ii
Concentration always matters and heat does since ΔH ≠ 0; pressure does not, as moles are 2 = 2.
Why the other options are wrong
- b i and iii: iii fails: 2 moles of gas each side; ii is true.
- c ii and iii: iii fails: pressure has no effect; i is true.
- d i, ii and iii: iii fails: the moles do not change, so pressure has no effect.
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