Coordination Compounds

Coordination Compounds

Question

The pair having the same magnetic moment is:

[At. No. : Cr=24, Mn=25, Fe=26, Co=27]

  • [Cr(H2O)6 ]2+ and [Fe(H2O)6 ]2+

  • [Mn(H2O)6 ]2+ and [Cr(H2O)6 ]2+

  • [CoCl4 ]2− and [Fe(H2O)6 ]2+

  • [Cr(H2O)6 ]2+ and [CoCl4 ]2−

Answer

A.

[Cr(H2O)6 ]2+ and [Fe(H2O)6 ]2+

Complex ion Electronic configuration metal ion Number of unpaired electrons (n)
[Cr(H2O)6 ]2+  Cr2+ ; [ar] 3d4
[Fe(H2O)6 ]2+ Fe2+ ; [Ar]3d6
[Mn(H2O)6 ]2+  Mn2+ ; [Ar] 3d5
[CoCl4 ]2−  Co2+ ; [Ar]3d7

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