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  4. What is the oxidation number of Mn in K2MnO4 ?

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Q. What is the oxidation number of Mn in $K_2MnO_4$ ?

UP CPMTUP CPMT 2014Redox Reactions

Solution:

Let the oxidation no. of $Mn$ be $x$.
$K_2MnO_4$
$\Rightarrow 2+ x+ 4(-2) = 0$
$2 + x-8 = 0$
$ \Rightarrow x = +6$