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Elementary and complex reactions, order and molecularity

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Mechanism of a hypothetical reaction X_2 + Y_2 → 2XY is given below :(i) X_2 → X + X (fast)(ii) X + Y_2 ⇌ XY + Y (slow)(iii) X + Y → XY (fast)The overall order of the reaction will be : Answer: 3. 1.5 Key idea: the rate law comes from the slow step; intermediates must be replaced using the fast equilibrium. Rate = k[X][Y₂] (... Elementary and complex reactions, order and molecularity 1 answer