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  4. The oxidation number of Mn in the product formed on strongly heating Mn 2 O 7 is .

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Q. The oxidation number of $Mn$ in the product formed on strongly heating $Mn _{2} O _{7}$ is ______.

Redox Reactions

Solution:

$2Mn_{2}O_{7} \xrightarrow{\Delta} 4MnO_{2}+3O_{2}$
$\therefore $ Oxidation number of $MnO _{2}$ is
$\Rightarrow x+2 \times(-2)=0$
$\Rightarrow x =+4$