MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Physical ChemistryChemical kineticsElementary & Complex Reactions

The chemical reaction, proceeds as O O [O] (fast) [O] O 2O -> (slow) The rate law expression will be

A.Rate = k [O] [O3] (b) Rate = k [O3]2 [O2]–1

C.Rate = k [O3]2

D.Rate = k [O2] [O]

Explanation

Slow step is rate determining step 3 2 O O O (fast) 3 2 2 O O O (slow) O is intermediate thus should not appear in the rate law 3 R k O O …(i) In 1st step 2 3 1 3 2 c c O O K O O K O O x Substituting, expression of O in (i) 1 3 2 3 2 1 1 3 2 x x x c R k K O O O R k O O

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