Question

In which of the following compounds manganese has oxidation number equal to that of iodine in $KI{O}_4?$

• A. Potassium manganate
• B. Potassium permanganate
• C. Manganous chloride
• D. Manganese chloride

Answer 1

Answer: (B)

Let oxidation number of $I$ in $KI{O}_4$ be $x$

$\therefore (+1)+x+4(-2)=0\Rightarrow x=+7$

Let oxidation number of $Mn$ in $KMn{O}_4$ be $x^{\prime }$

$\therefore (+1)+x^{\prime }+4(-2)=0\Rightarrow x^{\prime }=+7$