The reaction A2 + B2 2AB follows the mechanism A2 k1 k–1 A + A (fast) A + B2 2 k AB + B (slow) A + B AB (fast) The overall order of the reaction is : (A) 3 (B) 2 (C) 2.5 (D) 1.5

Question

The reaction A2 + B2 2AB follows the mechanism A2 k1 k–1 A + A (fast) A + B2 2 k AB + B (slow) A + B AB (fast) The overall order of the reaction is :

(A) 3
(B) 2
(C) 2.5
(D) 1.5

Prashant Kotian · Accepted Answer

Correct answer: D. A & B are intermediates from r.d.s. r = K[A] [B2] …(1) Keq = – k k = ] A [ ] A [ 2 or [A] = eq k 1 2] A [ …(2) Substituting value of [A] from (2) to (1) r = k eq k 1 2] A [ [B2] r = k' 1 2] A [ [B2] order = 1.5

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