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JEE Main202312 Apr 2023Morning ShiftChemistryChemical KineticsActual

The reaction 2 NO + Br 2 → 2 NOBr takes place through the mechanism given below NO + Br 2 ⇌ NOBr 2 fast NOBr 2 + NO → 2 NOBr slow The overall order of the reaction is _____.

Correct answer

0

Step-by-step solution

On applying Law of mass action over slowest step, R = k [ NOBr 2 ] [ NO ] The slowest step is the rate determining step. On applying Law of mass action on equilibrium of Step I k = NOBr 2 NO Br 2 NOBr 2 = k NO Br 2 Hence, overall rate equation will be R = k NO 2 Br 2 = k ' NO 2 Br 2 The overall order is equal to sum of the powers of the concentration terms in the rate law. The overall order of the reaction is 3.

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