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JEE Main 2023 · 24 Jan · Shift 2

JEE Main 2023 Chemistry question on Coordination Compounds

The hybridization and magnetic behaviour of cobalt ion in [Co(NH3)6]3+[\text{Co}(\text{NH}_3)_6]^{3+} complex, respectively is
  1. A.
    sp3d2\text{sp}^3\text{d}^2 and paramagnetic
  2. B.
    d2sp3\text{d}^2\text{sp}^3 and paramagnetic
  3. C.
    d2sp3\text{d}^2\text{sp}^3 and diamagnetic
  4. D.
    sp3d2\text{sp}^3\text{d}^2 and diamagnetic
Show answer and solution

Correct option: C

Solution

Co³⁺ is a d⁶ ion. NH₃ is a strong field ligand, so it causes pairing of all 6 d-electrons into the lower t₂g set (t₂g⁶ eg⁰), leaving two inner 3d orbitals empty. These two empty 3d orbitals combine with one 4s and three 4p orbitals to give d²sp³ (inner orbital) hybridization. Since all electrons are paired, the complex has zero unpaired electrons and is diamagnetic.

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