(D) To find the oxidation state of $Mn$ in $K_2MnO_4$,let the oxidation state of $Mn$ be $x$.The oxidation state of $K$ is $+1$ and the oxidation stat

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(D) To find the oxidation state of $Mn$ in $K_2MnO_4$,let the oxidation state of $Mn$ be $x$.The oxidation state of $K$ is $+1$ and the oxidation state of $O$ is $-2$.$2(+1) + x + 4(-2) = 0$$2 + x - 8 = 0$$x - 6 = 0$$x = +6$.Therefore,the oxidation state of $Mn$ in $K_2MnO_4$ is $+6$.