Which of the following species cannot function as an oxidizing agent?
Iodide cannot because it is already in its lowest oxidation state of -1 and to be an oxidizing agent it would have to be able to lower its oxidation state to -2 (or lower), which which is impossible.
The impossibility arises because it would have to expand its octet to get a 9th valence electron.
To do this, it must bind to a more electronegative species and also be in a highly positive oxidation state, which rules out the possibility of an OS of -2.
(all other species on this list are good oxidizing agents, except sulfur, which is reasonably good)
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