Question

When $Mn{O}_2$ is strongly heated to get oxygen gas, the oxidation number of Mn changes from +4 to?

• A. 0
• B. +1
• C. $+\frac{8}{3}$
• D. +2

Answer 1

Answer: (C)

$3Mn{O}_2\to M{n}_3{O}_4+O_2$
In $Mn{O}_2$ oxidation number of Mn is +4 and in $M{n}_3{O}_4$ it is $+\frac{8}{3}$ .