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Coordination Compounds

Question
CBSEENCH12011384
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The d-electron configuration of Cr3+, Mn2+, Fe2+ and Ni2+ are 3d4, 3d5, 3d6 and 3d8 respectively. Which one of the following aqua complexes will exhibit the minimum paramagnetic behaviour?

(At. no. Cr = 24, Mn = 25, Fe = 26, Ni = 28)

  • [Mn(H2O)6]2+

  • [Fe(H2O)6]2+

  • [Ni(H2O)6]2+

  • Cr(H2O)6]2+

Solution

A.

[Mn(H2O)6]2+

As the number of unpaired electron increases, the magnetic moment increases and hence the paramagnetic behaviour increases.
so, Cr2+ (22)  = 3d4 - 4 unpaired electrons
Mn2+ (23) = 3d5 - 5 unpaired electrons
Fe2+ (24)  = 3d6 - 4 unpaired electrons
Ni2+ (26) = 3d8 -2 unpaired electrons
So, [Ni(H2O)6]2+ exhibit minimum paramagnetic behaviour.

Some More Questions From Coordination Compounds Chapter

Write the formula for the following coordination compound:
Dichloridobis(ethane-1, 2-diamine)platinum(lV) nitrate.

Write the formula for the following coordination compound:
Iron(III) hexacyanidoferrate(II)

Write the IUPAC names of the following coordination compounds:
(i) [Co(NH3)6]Cl3
(ii) [Co(NH3)5Cl]Cl2
(iii) K3[Fe(CN)6]
(iv) K3[Fe(C2O4)3]
(v) K2[PdCl4]
(vi) [Pt(NH3)2Cl(NH2CH3)]Cl.

Indicate the type of isomerism exhibited by the following complexes and draw structures for these isomers:
(i)    K[Cr(H2O)2(C2O4)2],                      (ii) [Co(en)3Cl3,
(iii) [Co(NH3)5(NO2)]|NO3]2,                 (iv) [Pt(NH3)(H2O)Cl2]

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.

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