Match the LIST-I with LIST-II | LIST-I (Complex/Species) | LIST-II (Shape & magnetic moment) | |---|---| | A. [Ni(CO)4]…

🧠 Match Geometry + μ for Each Ni Complex

🗺️ Evaluate Each

| Complex | Metal/d-config | Ligand strength | Geometry | Unpaired | μ | |---|---|---|---|---|---| | A: $[\mathrm{Ni(CO)_4}]$ | Ni(0) d¹⁰ | strong (CO) | Td | 0 | 0 BM | | B: $[\mathrm{Ni(CN)_4}]^{2-}$ | Ni(II) d⁸ | strong (CN⁻) | sq pl | 0 | 0 BM | | C: $[\mathrm{NiCl_4}]^{2-}$ | Ni(II) d⁸ | weak (Cl⁻) | Td | 2 | 2.83 BM | | D: $[\mathrm{MnBr_4}]^{2-}$ | Mn(II) d⁵ | weak (Br⁻) | Td | 5 | 5.92 BM |

🗺️ Match List-II

| Complex | (Geometry, μ) | List-II label | |---|---|---| | A: Ni(CO)₄ | Td, 0 BM | III | | B: Ni(CN)₄²⁻ | sq pl, 0 BM | II | | C: NiCl₄²⁻ | Td, ~2.8 BM | I | | D: MnBr₄²⁻ | Td, 5.9 BM | IV |

So: A-III, B-II, C-I, D-IV.

⚡ Ni(II) Geometry by Ligand Strength

| Ligand | Geometry | |---|---| | Strong (CN⁻, CO) | Sq pl, diamagnetic | | Weak (Cl⁻, Br⁻, F⁻) | Td, paramagnetic (2 unpaired) | | Moderate (H₂O, NH₃) | Octahedral (with 2 extra ligands), paramagnetic |

⚠️ Ni(0) is d¹⁰, Always Diamagnetic

$[\mathrm{Ni(CO)_4}]$ has Ni(0) d¹⁰ — fully filled, μ = 0 regardless of geometry.

$\boxed{\text{Answer: (3) A-III, B-II, C-I, D-IV}}$