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What are the molecular shapes of the ammonia complexes formed by Ni²⁺, Pt²⁺, and Zn²⁺, respectively?

1. Octahedral, square planar, and tetrahedral
2. Square planar, octahedral, and tetrahedral
3. Tetrahedral, square planar, and octahedral
4. Octahedral, tetrahedral, and square planar

Correct answer: Octahedral, square planar, and tetrahedral

Solution

Ni²⁺ forms an octahedral complex due to its preference for six ligands. Pt²⁺ forms a square planar complex because of its d⁸ electronic configuration and strong ligand field stabilization. Zn²⁺ forms a tetrahedral complex as it has a filled d-orbital and prefers four ligands.

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