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Coordination Compounds

Question
CBSEENCH12007357
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Which of the two is more stable K4[Fe(CN)6] or K3[Fe(CN)6].

Solution
In K4[Fe(CN)6] oxidation state of iron is +2.
where as in K3[Fe(CN)6] oxidation state is +3. Since both have strong field ligand therefore pairing occur. in case of +2 oxidation state all electron is paired such that the configuration is T2g6. But in case of +3 oxidation state the configuration is T2g5.Hence K3[Fe(CN)6] more stable because Fe3+ is smaller in size and has higher charge than Fe2+.

Some More Questions From Coordination Compounds Chapter

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.

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

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