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The proposed mechanism for the decomposition of ozone is: Net reaction: 2O3 -> 3O2 Step 1 (fast equilibrium): O3 <=> O2 + O Step 2 (slow): O + O3 -> 2O2 From the following statements, which are correct? (P) Overall order of the reaction is 3/2 (Q) Overall order of the reaction is 1 (R) Increasing O2 concentration decreases the overall rate. (S) Decreasing O3 concentration increases the overall rate.
- P and R
- Q and R
- Q and S
- P and S
Correct answer: P and R
Solution
Rate law: rate = k_eff*[O3]²/[O2]. Overall order = 2+(-1) = 1 (Q correct, P wrong). Increasing [O2] decreases rate (R correct). Decreasing [O3] decreases rate, not increases (S wrong).
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