For the decomposition of $H_{2} O_{2}$ in alkaline medium in presence of iodide ion as catalyst, overall order is

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Detailed Solution

Mechanism

$\begin{array}{l} H_{2} O_{2} + I^{-} \overset{slow}{\to} H_{2} O + {IO}^{-} \\ {IO}^{-} + H_{2} O_{2} \to H_{2} O + O_{2} + I^{-} \\ Rate = K [H_{2} O_{2}] [I^{-}] \end{array}$

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