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NEET2013ChemistryCoordination CompoundsActual

Which among the following is a paramagnetic complex? (At. no. Mo =42, Pt =78, Co =27 )

Options

  1. A[ Co ( NH ₃ )₆ ]³⁺
  2. B[ Pt (e n) Cl ₂ ]
  3. C[ CoBr ₄ ]²⁻
  4. DMo ( CO )₆

Correct answer

C. [ CoBr ₄ ]²⁻

Step-by-step solution

[ CoBr ₄ ]²⁻ is a paramagnetic complex due to the following reasons: Br is a weak field ligand All tetrahedral complexes are high spin The low spin arrangement has 5 unpaired e ⁻ in d -orbitals

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