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Coordination Compounds

Question
CBSEENCH12011250
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Which of the following complex compounds will exhibit highest paramagnetic behaviour ?

At. no. : Ti = 22, Cr = 24, Co = 27, Zn = 30

  • [Ti(NH3)6]3+

  • [Cr(NH3)6]3+

  • [Co(NH3)6]3+

  • [Zn(NH3)6]2+

Solution

B.

[Cr(NH3)6]3+

a) Electronic configuration of Ti3+ in [Ti(NH3)6]3+


b) Electronic configuration of Cr3+ in [Cr(NH3)]3+

Electronic Configuration of Co3+ in [Co(NH3)6]3+


In the presence of strong field ligand NH3 pairing of electrons takes place and thus, octahedral complex, [Co(NH3)6]3+ is diamagnetic.
[Co(NH3)6]3+
Inner orbital or low spin complex


d) Electronic configuration of Zn2+ in [Zn(NH3)6]2+

therefore, [Zn(NH3)6]2+ is an outer orbital complex and its diamagnetic .

Some More Questions From Coordination Compounds Chapter

Write the formula for the following coordination compound:
Tetraaminediaquacobalt(lll)chloride

Write the formula for the following coordination compound:
Potassium tetracyanidonickelate(II)

Write the formula for the following coordination compound:
Tris(ethane -1, 2-diamine) chromium(III) chloride

Write the formula for the following coordination compound:
Amminebromidochloridonitrito-N-platinate (II)

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.

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