Give the formula of each of the following coordination entities :
(i) `Co^(3+)` ions is bound to one `Cl^(-)` one `NH_(3)` molecules and two bidentate ethylene diamine (en) molecules.
(ii) `Ni^(2+)` ions is bound to two water molecules and two oxalate ions.
Write the name and magnetic behaviour of each of the abvoe coordination entities.
(At. nos. `Co = 27, Ni = 28`)

Explanation

To solve the question, we need to determine the formulas, names, and magnetic behavior of the given coordination entities. Let's break it down step by step.

### Part (i): Cobalt Coordination Entity

1. **Identify the central metal ion and ligands:**
- Central metal ion: `Co^(3+)`
- Ligands:
- 1 `Cl^(-)` (Chloride)
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