Amongst the following identify the species with an atom in +6 oxidation state:

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Problem

Amongst the following identify the species with an atom in +6 oxidation state: (1)

\text{MnO}_4^-

(2)

\text{Cr}(\text{CN})_6^{3-}

(3)

\text{NiF}_6^{2-}

(4)

\text{CrO}_2\text{Cl}_2