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Coordination Compounds

Question
CBSEENCH12011067
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Cobalt (III) chloride forms several octahedral complexes with ammonia, which of the following will not give a test for chloride ions with silver nitrated at 250 C? 

  • CoCl. 3NH3

  • CoCl. 4NH3

  • CoCl. 5NH3

  • CoCl. 6NH3

Solution

A.

CoCl. 3NH3

a) [Co(NH3)3Cl3] --> [Co(NH3)2Cl3]
b) [Co(NH3)4Cl2]Cl --> [Co(NH3)4Cl2]+ +Cl-
c)[Co(NH3)5Cl]Cl2  --> [Co(NH3)5Cl]+ +2Cl-
d) [Co(NH3)6Cl]Cl2  --> [Co(NH3)6]+ +3Cl-
In the compound (a) does not ionise so does not give test for chloride ions.

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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