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When a metal cation M²⁺ is treated with dimethylglyoxime in an ammoniacal medium, a highly stable bright red precipitate is formed. The hybridization of the central metal atom and the magnetic nature of this precipitate are respectively:

Options

  1. Adsp² and diamagnetic
  2. Bsp³ and paramagnetic
  3. Csp³ and diamagnetic
  4. Ddsp² and paramagnetic

Correct answer

A. dsp² and diamagnetic

Step-by-step solution

The formation of a bright red precipitate with dimethylglyoxime (DMG) in an ammoniacal medium is a characteristic test for the Ni²⁺ cation. The complex formed is bis(dimethylglyoximato)nickel(II), [Ni(dmg)₂] . In this complex, Ni²⁺ has a 3d⁸ electronic configuration. DMG acts as a strong field bidentate ligand due to the formation of stable five-membered chelate rings stabilized by intramolecular hydrogen bonding. This strong ligand field forces the pairing of the 3d electrons, leaving one 3d orbital empty. Therefo

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