The pair of metal ions that can give a spin only magnetic moment of 3.9   B M for the complex [ M ( H…

The pair of metal ions that can give a spin only magnetic moment of 3.9 BM for the complex [M(H2O)6]Cl2 , is:
  1. Co2+ and Fe2+
  2. V2+ and Fe2+
  3. Cr2+ and Mn2+
  4. V2+ and Co2+

Solution

If the complex is MH2O6Cl2, M will have +2 oxidation state and hence, it has already lost 2 electrons from s- orbital. Since it has μ=3.9 = n( n+2 ) ⇒n=3

3 unpaired so, the configuration can either be:

Asked in: JEE Main 2019 (12 Jan Shift 1)

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