In which of the following compounds, the oxidation number of iodine is fractional? (a) \( \mathr...

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In which of the following compounds, the oxidation number of iodine is fractional?
(a) \( \mathrm{IF}_{7} \)
(b) \( \mathrm{I}_{3}^{-} \)
(c) \( \mathrm{IF}_{5} \)
(d) \( \mathrm{IF}_{3} \)
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