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Coordination Compounds
Question
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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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Some More Questions From Coordination Compounds Chapter

Explain on the basis of valence bond theory that [Ni(CN)4]2–  ion with square planar is diamagnetic and the [NiCl4]2– ion with tetrahedral geometry is paramagnetic.

Predict the number of unpaired electrons in the square planar [Pt(CN)4,]2– ion.

The hexaquo manganese(II) ion contains five unpaired electrons, while the hexacynoion contains only one unpaired electron. Explain using crystal field theory.

Calculate the overall complex dissociation equilibrium constant for the Cu(NH3)42+ion, given β4 for this complex is 2.1 x 1013.

Identify the ligands from the following coordination compounds:
(a)    [Co(en)2Cl(NO2)2]
(b)    K[Co(CN)(CO2)(NO)]
(c)    K3[Al(OH)6]
(d)    [Co(H2O)2(NH3)4](OH)3

Write IUPAC name of the following complexes:
(a)    [Fe(H2O)6]SO4
(b)    [Cu(en)2(NO3)2