List of top Chemistry Questions on Coordination Compounds

Draw figure to show the splitting of d orbitals in an octahedral crystal field.
Aqueous copper sulphate solution (blue in colour) gives:
(i) a green precipitate with aqueous potassium fluoride, and
(ii) a bright green solution with aqueous potassium chloride Explain these experimental results.

Write all the geometrical isomers of \([Pt(NH_3)(Br)(Cl)(py)\)] and how many of these will exhibit optical isomers?

How many geometrical isomers are possible in the following coordination entities? 
(i)\( [Cr(C_2O_4)_3]^{ 3–} \)
(ii)\( [Co(NH_3)_3Cl_3]\)

Using IUPAC norms write the systematic names of the following: 
(i)\( [Co(NH_3)_6]Cl_3 \)
(ii) \([Pt(NH_3)_2Cl(NH_2CH_3)]Cl \)
(iii) \([Ti(H_2O)_6]^{3+} \)
(iv) \([Co(NH_3)_4Cl(NO_2)]Cl \)
(v)\( [Mn(H_2O)_6]^{2+}  \)
(vi) \([NiCl_4]^{2–}\)
(vii) \([Ni(NH_3)_6]Cl_2   \)
(viii) \([Co(en)_3]^{3+} \) 
(ix)\( [Ni(CO)_4]\)
Using IUPAC norms write the formulas for the following: 
(i) Tetrahydroxidozincate(II) 
(ii) Potassium tetrachloridopalladate(II) 
(iii) Diamminedichloridoplatinum(II) 
(iv) Potassium tetracyanidonickelate(II) 
(v) Pentaamminenitrito-O-cobalt(III)
(vi) Hexaamminecobalt(III) sulphate ) 
(vii) Potassium tri(oxalato)chromate(III)  
(viii) Hexaammineplatinum(IV)  
(ix) Tetrabromidocuprate(II)  
(x) Pentaamminenitrito-N-cobalt(III)

Specify the oxidation numbers of the metals in the following coordination entities: 
(i)\( [Co(H_2O)(CN)(en)_2] ^{2+}\)
(ii) \([CoBr_2(en)_2]^{+}\)
(iii)\( [PtCl_4]^{ 2–} \)
(iv) \(K_3[Fe(CN)_6]\)
(v) \([Cr(NH_3)_3Cl_3] \)

What is meant by unidentate, didentate and ambidentate ligands? Give two examples for each.
Explain with two examples each of the following: coordination entity, ligand, coordination number, coordination polyhedron, homoleptic and heteroleptic.

\(FeSO_4\) solution mixed with\( (NH_4)_2SO_4 \) solution in\( 1:1\) molar ratio gives the test of \(Fe^{2+}\) ion but \(CuSO_4\) solution mixed with aqueous ammonia in \( 1:4 \) molar ratio does not give the test of \(Cu^{2+}\) ion. Explain why?

Explain the bonding in coordination compounds in terms of Werner’s postulates.