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In which of the following complexes the nickel metal is in highest oxidation state:

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In which of the following complexes the nickel metal is in highest oxidation state:
A. `Ni(CO)_(4)`
B. `K_(2)[NiF_(6)]`
C. `[Ni(NH_(3))_(6)](BF_(4))_(2)`
D. `[K_(2)[Ni(CN)_(4)]`
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Correct Answer - B
In `K_(2)NiF_(6)` oxidation state of nickel is `+4`.
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