Question

Oxidation number of iodine in $I{O}_3^{-}$, $I{O}_4^{-}$, $KI$ and $I_2$ respectively is

• A. -2, -5, -1, 0
• B. +5, +7, -1, 0
• C. +2, +5, +1, 0
• D. - 1, +1, 0, +1

Answer 1

Answer: (B)

$I{O}_3^{-}\to x+3\left(-2\right)=-1\Rightarrow x=+5$
$I{O}_4^{-}\to x+4\left(-2\right)=-1\Rightarrow x=+7$
$KI\to +1+x=0\Rightarrow x=-1$
$I_2\to 0\Rightarrow x=0$