The oxidation number of `Co` in the complex ion

The oxidation numbe of Co in the complex ion is :

The oxidation number of 'Co' in the complex K[Co(CO)4] is _____

For the coordination complex ion [Co(NH_(3))_(6)]^(3+) . What is the oxidation number of cobalt in the complex ion?

The oxidation number of nickel in the complex ion [NiCl_4]^(2-) is

The oxidation number of Nickel in the complex ion, [NiCl_4]^(2-) is

The oxidation number of Nickel in the complex ion, [NiCl_4]^(2-) is

The oxidation number of Nickel in the complex ion, [NiCl_4]^(2-) is

[Fe(CN)_(6)]^(4-) is a coordination complex ion. Calculate the oxidation number of iron in the complex.

[CoF_6]^(3-) is a coordination complex ion. What is the oxidation number of cobalt in the complex ?

[CoF_6]^(3-) is a coordination complex ion. What is the oxidation number of cobalt in the complex?