Given is the mechanism of decomposition of N2O5.(i) N2O5 → NO2 + NO3(ii) NO2 + NO3 → NO + NO2 + O2(iii) NO + NO3 → 2 NO2The order of reaction is:
Correct answer: A. 1
- A. 1
- B. 2
- C. 3
- D. 0
Explanation
The decomposition of N2O5 is described by a three-step mechanism. The first step, N2O5 → NO2 + NO3, is the slowest and thus the rate-determining step. This means the overall reaction rate is dependent on the concentration of N2O5 alone, making the reaction first order. The other steps occur more quickly and do not affect the overall rate. Options B, C, and D are incorrect because they suggest reaction orders inconsistent with the given mechanism.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Reaction Kinetics
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.
Practise Reaction Kinetics
573 free Reaction Kinetics MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Chemistry questions like this
Chemistry is on 14 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Reaction Kinetics questions
Which of the following physical methods is used to determine rate of reaction when rate of reaction depends on the rate of change in the concentration of reacting ions or ions are formed during the reaction?
Concentrated sugar solution under goes hydrolysis into glucose and fructose by an enzyme_
Which of the following best explains the effects of a catalyst on the rate of a reversible reaction?
Consider the following reaction: 2FeCl3+6KI → 2Fe2+ + 6KCl+I2Rate = [FeCl3]1[KI]1. Choose the correct molecularity and order of a reaction.
Each of these substances _in Pakistan.
Select the most suitable synonym for the given word:CAPACIOUS