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Coordination Compounds

Question
CBSEENCH12010247
Wired Faculty App

Write the name, stereochemistry and magnetic behavior of the following: 

(At. nos. Mn = 25, Co = 27, Ni = 28) 

 (i) K4[Mn (CN)6] 

 (ii) [Co (NH3)5Cl]Cl2

 (iii) K2[Ni (CN)4]

Solution

(i) K4 [Mn (CN)6]

Name: Potassium hexacyanomanganate (II) 

 Stereochemistry - Does not show geometric or optical isomerism 

 Magnetic behaviour - Paramagnetic 

 

(ii) [Co (NH3)5Cl]Cl2

 Name-Pentaamminechloridocobalt (III) Chloride 

 Stereochemistry- Does not geometric isomerism but is optically active 

 Magnetic behavior- Paramagnetic 

 

(iii) K2[Ni (CN)4] 

 Name: Potassium tetracyanonickelate (II) 

 Stereochemistry -Does not show geometric or optical isomerism 

 Magnetic behaviour - Diamagnetic

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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