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Question
In which of the following complexes, nickel is in the highest oxidation state?
Options:
A .  K4[Ni(CN)4]
B .  [K2NiF6]
C .  [Ni(CO)4]
D .  [Ni(CN)4]2−
Answer: Option B
:
B
Nickel has + 4 oxidation state.

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