Identify the oxidation number of each metal center in the following coordination compounds.
i. [Cr(en)₂(CO)Cl]²⁺
ii. Co(H₂O)₃(CN)₃
iii. [Ni(C₂O₄)₂(NH₃)₂]^2–
iv. [Fe(OH)₅]^3–
v. Cr(CO)₆

i. Oxidation number Cr: +3

ii. Oxidation number Co: 0

iii. Oxidation number Ni: +2

iv. Oxidation number Fe: +3

v. Oxidation number Cr: +2

i. Oxidation number Cr: +2

ii. Oxidation number Co: +3

iii. Oxidation number Ni: +3

iv. Oxidation number Fe: +2

v. Oxidation number Cr: +2

i. Oxidation number Cr: +2

ii. Oxidation number Co: 0

iii. Oxidation number Ni: +3

iv. Oxidation number Fe: +3

v. Oxidation number Cr: 0

i. Oxidation number Cr: +3

ii. Oxidation number Co: +3

iii. Oxidation number Ni: +2

iv. Oxidation number Fe: +2

v. Oxidation number Cr: 0