Question

What is oxidation number of cobalt in Tris (ethylene diammine) cobalt (III) ion?

Answer 1

Since ethylene diammine is a neutral molecule, the oxidation number of cobalt in the complex ion must be +3. Again, remember that you never have to indicate the number of cations and anions in the name of an ionic compound.

Solution: potassium is the cation and the complex ion is the anion.

Answer 2

The oxidation number of cobalt in Tris (ethylene diammine) cobalt (III) ion is +3.

Explanation:

A coordination complex consists of a central metal atom or ion bonded to ligands by coordinate covalent bonds. The ligands and the central metal together form the coordination sphere.

The formula of Tris (ethylene diammine) cobalt (III) ion  $[Co(en)_3]^{3+}$

Coordination sphere consists of three ethylene diammine (en) neutral ligands . As it is given that the coordination sphere carries +3 charge.

Let the oxidation state of Co = x

∴ x + 3(0)= +3

x = +3

Oxidation state of Co = +3

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