Question

In which of the following compounds, the oxidation number of iodine is fractional?

• A. $I{F}_7$
• B. $I_3^{-}$
• C. $I{F}_5$
• D. $I{F}_3$

Answer 1

Answer: (B)

Let oxidation no. of I in $I_3^{-}$ be $x$.

$\therefore 3x=-1\Rightarrow x=-\frac{1}{3}$