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In the presence of I^(-) (aq), decomposi...

In the presence of `I^(-)` (aq), decomposition of `H_2 O_2(aq)` is shown in the following reaction:
`2H_2 O_2 (aq) to 2H_2 O(l) +O_2 (g)`
it follows rate law as, rate`= k_2 [H_2O_2] [I^(-)]`
what is the role of catalyst ?

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