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Among these, identify the species with a...

Among these, identify the species with an atom in `+6` oxidation state: .

A

`MnO_(4)^(-)`

B

`Cr(CN)_(6)^(3-)`

C

`NiF_(6)^(2-)`

D

`CrO_(2)Cl_(2)`

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The correct Answer is:
d
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