Explain the following complexes with respect to structural shapes of units, magnetic behaviour and hybrid orbitals involved in the units :
`[Cr(NH_3)_6]^(3+)` , `[Ni(CO)_4]`

Explanation

To explain the complexes \([Cr(NH_3)_6]^{3+}\) and \([Ni(CO)_4]\) with respect to their structural shapes, magnetic behavior, and hybrid orbitals involved, we can break down the solution into detailed steps.

### Step 1: Analyze the Complex \([Cr(NH_3)_6]^{3+}\)

1. **Determine the Oxidation State of Chromium:**
- Ammonia (NH₃) is a neutral ligand, so the oxidation state of chromium (Cr) in \([Cr(NH_3)_6]^{3+}\) is +3.

2. **Write the Electronic Configuration of Cr:**
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