Chemistry · May / June 2018 · Paper 12 · Question 21
5070Reversible reactions and equilibrium
Nitrogen reacts with oxygen in an equilibrium reaction. N2(g) + O2(g) ⇌ 2NO(g) ΔH = +170 kJ / mol When the reaction is at equilibrium, which statement is correct?
- AThe concentration of nitrogen present will change with time.
- BThe forward and backward reactions are taking place at the same rate.
- CThe forward reaction releases heat energy.
- DThere are more molecules on the left hand side of the equation than on the right.
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Correct answer: B. The forward and backward reactions are taking place at the same rate.
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