(A) The oxidation number of $Mn$ in $MnO_4^{-}$ is calculated as follows: Let the oxidation number of $Mn$ be $x$. For oxygen,the oxidation number is

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(A) The oxidation number of $Mn$ in $MnO_4^{-}$ is calculated as follows: Let the oxidation number of $Mn$ be $x$. For oxygen,the oxidation number is $-2$. $x + (4 \times -2) = -1$ $x - 8 = -1$ $x = +7$ Therefore,the oxidation number of $Mn$ is $+7$.