Consider the decomposition of hydrogen peroxide in alkaline medium which is catalysed by iodide ions. 2H_2O_2 overset(OH^(-))to 2H_2O + O_2 This reaction takes place in two steps as given below : Step I H_2O_2 + I^(-) to H_2O + IO^(-)(slow ) Step II H_2O_2 + IO^(-) to H_2O + I^(-) + O_2 ( fast ) (a) Write the rate law expression and determine the order of reaction w.r.t. H_2O_2. (b)What is the molecularity of each individualstep ?

Consider the decomposition of hydrogen peroxide in alkaline medium whi

1.	Consider the decomposition of hydrogen peroxide in alkaline medium which is catalysed by iodide ions. 2H_2O_2 overset(OH^(-))to 2H_2O + O_2 This reaction takes place in two steps as given below : Step I H_2O_2 + I^(-) to H_2O + IO^(-)(slow ) Step II H_2O_2 + IO^(-) to H_2O + I^(-) + O_2 ( fast ) (a) Write the rate law expression and determine the order of reaction w.r.t. H_2O_2. (b)What is the molecularity of each individualstep ?
Answer» Solution :(a) Rate `=K[H_2O][IO^(-)]` As , there is ONE moleculeof `H_2O_2` involved in the slow step, order of the reaction w.r.t. `H_2O_2` is 1 . (B) Molecularityof step I = 2 . Molecularity of step II =2 .