Fundamentholfundamenthol
JEE Main2019Chemistry
Q.

The pair of metal ions that can give a spin only magnetic moment of 3.9 BM for the complex [M(H2 O)6 ]Cl2 , is 

  1. A

    V2+ and Co2+ 

  2. B

    Co2+ and Fe2+

  3. C

    V2+ and Fe2+

  4. D

    Cr2+ and Mn2+ 

Solution

= 3.9 BM

So, the central metal ion has 3 unpaired electrons.

Configuration is either d3 or d7 as H2O is a weak field ligand.

V2+ has d3 configuration.

Co2+ has d7 configuration.

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