Consider the following proposed mechanism for the decomposition of hydrogen peroxide…

CHEMISTRY · Single correct · A Level · Chemistry · Kinetics · Kinetics

Problem

Consider the following proposed mechanism for the decomposition of hydrogen peroxide in aqueous solution: Step 1: I−(aq)+H2O2(aq)→IO−(aq)+H2O(l)\text{I}^-(aq)+\text{H}_2\text{O}_2(aq)\rightarrow\text{IO}^-(aq)+\text{H}_2\text{O}(l) Step 2: IO−(aq)+H2O2(aq)→I−(aq)+H2O(l)+O2(g)\text{IO}^-(aq)+\text{H}_2\text{O}_2(aq)\rightarrow\text{I}^-(aq)+\text{H}_2\text{O}(l)+\text{O}_2(g) Which species acts as a catalyst in this mechanism? (a) IO−\text{IO}^- (b) H2O\text{H}_2\text{O} (c) I−\text{I}^- (d) H2O2\text{H}_2\text{O}_2

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