Q. 84.4( 18 Votes )

For a reaction

The proposed mechanism is as given below :

(1) H2O2 + I- H2O + IO- (slow)

(2) H2O2 + IO- H2O + I- + O2 (fast)

(i) Write rate law for the reaction.

(ii) Write the overall order of reaction.

(iii) Out of steps (1) and (2), which one is rate determining step?

Answer :

(i) As we know, the rate of a complex reaction depends on the slowest step of the reaction mechanism. Therefore the rate law for the reaction will be as follows

Rate= k [H2O2][I-]

(ii) The overall order of the reaction is 1+1 =2

Explanation: Order of the reaction is the sum of powers of reactants in the rate law of any reaction.

(iii) Step 1 is the rate determining step as it is the slowest step and the overall rate of a reaction depends on the slowest step.

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