Coordination CompoundHard

Question

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

Options

A.Ni(CO)4
B.K2NiF6
C.[Ni(NH3)6](BF4)2
D.K4[Ni(CN)6]

Solution

Let x be the oxidation state of nickel then,
(A) Ni(CO)4 ; x + 4 (0) = 0 or x = 0;                    
(B) [NiF6]2- ; x + 6 (-1) = - 2 or  x = + 4.
(C) [Ni(NH3)6]2+ ; x + 4 (0) = +2 or x = +2
(D) [Ni(CN)6]4- ; x + 6 ( -1) = - 4 or x = + 2

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