Answer:
The correct option is: +4, 5, and 5
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.
[CoBr(NH₃)₄]PO₄
Central metal atom - Co
Coordination sphere consists of 1 Br⁻ and 4 NH₃ ligands
<em>Therefore, the coordination number= 5</em>
Let the oxidation state of Co = x
Oxidation state of Br⁻ ligand = (-1)
Oxidation state of NH₃ ligand = 0
Oxidation state of PO₄³⁻ ligand = -3
∴ x + (-1) × 1 + 0 × 4 + (-3) × 1 = 0
⇒ x = +4
<em>Oxidation state of Co = +4</em>
Electron configuration of Co in ground state: [Ar] 3d⁷ 4s²
Electron configuration of Co in +4 oxidation state: [Ar] 3d⁵ 4s⁰
<em>Therefore, the number of d electrons in cobalt ion = 5</em>
