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KineticsMCQ

For the reaction NO2(g) + CO(g) → NO(g) + CO2(g) at temperatures below 500 K, the rate law is rate =Kinetics Chemistry Question

Question

For the reaction NO2(g) + CO(g) → NO(g) + CO2(g) at temperatures below 500 K, the rate law is rate = k [NO2]2. Which mechanism is consistent with this information?
Mechanism 1
NO2 + NO2 → NO3 + NO slow
CO + NO3 → CO2 + NO2 fast
Mechanism 2
NO2 + NO2 ⇌ NO3 + NO fast
CO + NO3 → CO2 + NO2 slow

A.

1 only

✓ Correct
B.

2 only

C.

either 1 or 2

D.

neither 1 nor 2

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