What is the oxidation state of $M n$ in $[M n (C N)_{5}]^{2 -}$ ?

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Solution

The correct option is C $3$
${[M n {(C N)}_{5}]}^{2 -}$
Central atom $= M n$
Oxidation state of $C N$ in general $= - 1$
Applying formula, $Sum of total oxidation state of all atoms = Overall charge on the compound .$
Let oxidation state of $M n = x x + 5 (- 1) = - 2, x = + 3$
$∴$ Oxidation state of $M n = + 3.$

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