The Gas Phase Reaction of Nitrogen Dioxide and Carbon Monoxide $\rarr$

question 23

Multiple Choice

The gas phase reaction of nitrogen dioxide and carbon monoxide was found experimentally to be second-order with respect to NO₂, and zero-order with respect to CO below 25°C. NO₂ + CO $\rarr$ NO + CO₂
Which one of the following mechanisms is consistent with the observed reaction order?

• A)NO₂ + 2CO N + 2CO₂ fast N + NO₂ \(\rarr\) 2NO slow
• B)NO₂ + 2CO \(\rarr\)N + 2CO₂ slow N + NO₂ \(\rarr\) 2NO fast
• C)NO₂ + NO₂ \(\rarr\) NO₃ + NO fast NO₃ + CO \(\rarr\)NO₂ + CO₂ slow
• D)NO₂ + NO₂ \(\rarr\) NO₃ + NO slow NO₃ + CO \(\rarr\)NO₂ + CO₂ fast

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