Question

What is the oxidation number of manganese in $M{n}_2{O}_7$?

• A. +7
• B. +6
• C. -7
• D. -6

Answer 1

The correct option is A

+7

$M{n}_2{O}_7$

$2x+(-2)\left(7\right)=0$

$x=\frac{14}{2}$ = +7

Oxidation number of Mn in $M{n}_2{O}_7$ is +7.