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  4. When MnO2 is strongly heated to get oxygen gas, the oxidation number of Mn changes from +4 to?

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Q. When $MnO_{2}$ is strongly heated to get oxygen gas, the oxidation number of Mn changes from +4 to?

NTA AbhyasNTA Abhyas 2020The d-and f-Block Elements

Solution:

$3MnO_{2} \rightarrow Mn_{3}O_{4}+O_{2}$

In $MnO_{2}$ oxidation number of Mn is +4 and in $Mn_{3}O_{4}$ it is $+\frac{8}{3}$ .