Given is the mechanism of decomposition of N2O5. (i) N2O5 → NO2 + NO3 (ii) NO2 + NO3 → NO + NO2 + O2 (iii) NO + NO3 → 2 NO2 The order of reaction is:
Correct answer: A. 1
- A. 1
- B. 2
- C. 3
- D. 0
Explanation
The overall reaction for the decomposition of N2O5 is:N2O5 → 2NO2From the provided mechanism, we can see that the rate-determining step (slowest step) is the first one:N2O5 → NO2 + NO3Since the rate of the overall reaction depends on the rate of this step, the reaction is first order with respect to N2O5.Therefore, option a is correct.
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Reaction kinetics relates reaction rate to concentration, temperature, surface area and catalysts. Questions cover rate laws, reaction order, rate constants, activation energy and the activated complex, including how a catalyst lowers the activation energy without changing the overall energy change or equilibrium position.
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