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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 → NO + CO2 Which one of the following mechanisms is consistent with the observed reaction order NO2 + 2CO → N + 2CO2: fast; N + NO2 → 2NO: slow or NO2 + NO2 → NO3 + NO: fast; NO3 + CO → NO2 + CO2: slow