Which of the following species has an atom with $+ 6$ oxidation state?

{M n O}_{4}^{-}

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C r {(C N)}_{6}^{3 -}

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{N i F}_{6}^{2 -}

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C r O_{2} C l_{2}

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Solution

The correct option is D $C r O_{2} C l_{2}$
The oxidation state of chromium is $+ 6$ .
$C r O_{2} C l_{2} \to x + (- 4) + (- 2) = 0 \Rightarrow x = + 6$
The oxidation states of central atoms in other three compounds are:
${M n O}_{4}^{-}$ $= + 7$

$C r {(C N)}_{6}^{3 -}$ $= + 3$

${N i F}_{6}^{2 -}$ $= + 4$

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