Question

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

• A. $K_4\left[Ni\right(CN{)}_4]$
• B. $\left[K_{2}Ni{F}_6\right]$
• C. $\left[Ni\right(CO{)}_4]$
• D. $\left[Ni\right(CN{)}_4{]}^{2-}$

Answer 1

The correct option is B $\left[K_{2}Ni{F}_6\right]$

Nickel has + 4 oxidation state.