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Among the following, the species in which oxidation state of an element is +6, is :

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$Cr (CN)_{6}^{3 -}$

${NiF}_{6}^{2 -}$

${CrO}_{2} {Cl}_{2}$

${MnO}_{4}^{-}$

answer is D.

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Detailed Solution

The oxidation number of manganese in ${MnO}_{4}^{-}$ is 7.

The oxidation number of chromium in $Cr (CN)_{6}^{3 -}$ is +3.

The oxidation number of nickels in ${NiF}_{6}^{2 -}$ is +4.

The oxidation number of chromium in ${CrO}_{2} {Cl}_{2}$ is +6.

Hence, the species in which an element has oxidation number +6 is ${CrO}_{2} {Cl}_{2}$ .

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