The geometries of the ammonia complexes of `Ni^(2+),Pt^(2+)` and `Zn^(2+)`, respectively, are

Options

A. octahedral , square planar and tetrahedral
B. square planar , octahedral and tetrahedral
C. tetrahedral and square planar and octahedral
D. octahedral , tetrahedral and square planar

Answer

To determine the geometries of the ammonia complexes of \( \text{Ni}^{2+} \), \( \text{Pt}^{2+} \), and \( \text{Zn}^{2+} \), we can follow these steps:

### Step 1: Identify the Coordination Numbers
- Ammonia (\( \text{NH}_3 \)) is a bidentate ligand and can coordinate to metal ions.
- For \( \text{Ni}^{2+} \) and \( \text{Pt}^{2+} \), the coordination number is typically 6, leading to octahedral geometry.
- For \( \text{Zn}^{2+} \), the coordination number is typically 4, leading to tetrahedral geometry.

### Step 2: Determine the Geometries
- **Nickel Complex**: \( \text{Ni(NH}_3\text{)}_6^{2+} \)
- Geometry: **Octahedral**

- **Platinum Complex**: \( \text{Pt(NH}_3\text{)}_4^{2+} \)
- Geometry: **Square Planar**

- **Zinc Complex**: \( \text{Zn(NH}_3\text{)}_4^{2+} \)
- Geometry: **Tetrahedral**

### Step 3: Summarize the Results
- The geometries of the ammonia complexes are:
- \( \text{Ni}^{2+} \): Octahedral
- \( \text{Pt}^{2+} \): Square Planar
- \( \text{Zn}^{2+} \): Tetrahedral

### Final Answer
The geometries of the ammonia complexes of \( \text{Ni}^{2+} \), \( \text{Pt}^{2+} \), and \( \text{Zn}^{2+} \) are **Octahedral, Square Planar, and Tetrahedral**, respectively.

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