Question

In the coordination compound, K₄[Ni(CN)₄], the oxidation state of nickel is
(a) 0
(b) +1
(c) +2
(d) –1

Answer 1

option (a) is correct. bcz if you see .There are 4k atoms which gives 4k+ and the complex ion will be 4 -ve ..Also CN is a negative ligand.. Hence charge on Ni is 0.

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