Question

In which of the following compounds manganese has an 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

The correct option is B Potassium permanganate

${KIO}_4\Rightarrow$

Let Iodine has $x$ oxidation number

$1+x+4(-2)=0$

$x=8-1$

$x=7$

${KMnO}_4\Rightarrow$

Let $Mn$ has oxidation number

$1+a+4(-2)=0$

$a=7$