Determine the oxidation number of the central metal in each complex ion:

i. [Fe(CN)₆]^3-

ii. [Ni(NH₃)]²⁺

iii. [Zn(H₂O)₆]²⁺

Determine the oxidation number of each metal center in the following complex ions.

i. [Mo(CN)₈]^4–

ii. [Cr(EDTA)(CO)]^–

iii. [Au(CN)₂]^–

iv. [Cd(NO₂)₄]^2–

v. [V(NH₃)₅Br]²⁺