Chemistry 5070 · O Level · Exothermic and endothermic reactions

Exothermic and endothermic reactions — practice question

Nitrogen oxides can be produced in the atmosphere when lightning occurs. $\text{N}_2 + \text{O}_2 \rightarrow 2\text{NO}$ This reaction is endothermic. Which energy profile diagram is the correct one for this reaction?

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