Induction by Iron(II) of the Oxidation of Iodide by Dichromate - 2 of 2

To test the hypothesis, an acidified iron(III) solution is added to iodide solution. No formation of brown triiodide is observed. Can you devise mechanisms involving the initial formation of chromium(V) or iron(V) intermediates which will account for the induction of the reaction by iron(II)?

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