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A hypothetical reaction A 2 + B 2 → 2 A B follows the mechanism as given below: A 2 A ← → + A ( fast ) A + B 2 → A B + B   ( s l o w ) A + B → A B   ( f a s t ) What will be the order of the overall reaction?

Options

  1. A2
  2. B1
  3. C3 2
  4. D0

Correct answer

C. 3 2

Step-by-step solution

r = k A B 2 And k c = A [ A ] [ A 2 ]   o r   A = k c 1 / 2 A 2 1 2 Thus, r = k . k c 1 2 [ A 2 ] 1 2 [ B 2 ] overall order is 3 2 .

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