List of top Chemistry Questions on Coordination Compounds asked in CBSE CLASS XII

Draw the structures of optical isomers of:
(i) \([Cr(C_2O_4)_3]^{3–}\)
(ii) \([PtCl_2(en)_2]^{2+}\)
(iii) \([Cr(NH_3)2Cl_2(en)]^{+}\)

Discuss briefly giving an example in each case the role of coordination compounds in:

biological systems
medicinal chemistry
analytical chemistry
extraction/ metallurgy of metals

The oxidation number of cobalt in \(K[Co(CO)_4]\) is

List various types of isomerism possible for coordination compounds, giving an example of each

Discuss the nature of bonding in metal carbonyls

What is spectrochemical series? Explain the difference between a weak field ligand and a strong field ligand.

Write down the IUPAC name for each of the following complexes and indicate the oxidation state, electronic configuration and coordination number. Also give stereochemistry and magnetic moment of the complex:
\((i) K[Cr(H_2O)_2(C_2O_4)_2].3H_2O\)
\((ii)[Co(NH_3)_5Cl]Cl_2\)
\((iii) CrCl_3(py)_3\)
\((iv) Cs[FeCl_4]\)
\((v)K_4[Mn(CN)_6]\)

Discuss the nature of bonding in the following coordination entities on the basis of valence bond theory:
\((i) [Fe(CN)_6]^{4-} \)
\((ii) [FeF_6]^{3-}\)
\((iii) [Co(C_2O_4)_3]^{3-} \)
\((iv) [CoF_6]^{3-}\)

Amongst the following, the most stable complex is

Amongst the following ions which one has the highest magnetic moment value?
(i) \([Cr(H_2O)_6]^{3+}\)
(ii) \([Fe(H_2O)_6]^{2+} \)
(iii)\( [Zn(H_2O)_6]^{2+}\)

\([Cr(NH_3)_6]^{3+}\) is paramagnetic while \([Ni(CN)_4]^{2-}\) is diamagnetic. Explain why?

How many ions are produced from the complex \(Co(NH_3)_6Cl_2\) in solution?

What is meant by the chelate effect? Give an example

What is meant by stability of a coordination compound in solution? State the factors which govern stability of complexes.

Give the oxidation state, d-orbital occupation and coordination number of the central metal ion in the following complexes:
(i) \(K_3[Co(C_2O_4)_3] \)
(ii)\( cis-[Cr(en)_2Cl_2]Cl \)
(iii) \((NH_4)_2[CoF_4] \)
(iv) \([Mn(H_2O)_6]SO_4\)

\([Fe(CN)_6]^{4-}\) and \([Fe(H_2O)_6]^{2+}\) are of different colours in dilute solutions. Why?

A solution of \([Ni(H_2O)_6]^{2+}\) is green but a solution of \([Ni(CN)_4]^{2-}\) is colourless. Explain.

What is crystal field splitting energy? How does the magnitude of\( Δo\) decide the actual configuration of d-orbitals in a coordination entity?

Draw figure to show the splitting of d orbitals in an octahedral crystal field.

What is the coordination entity formed when excess of aqueous \(KCN\) is added to an aqueous solution of copper sulphate? Why is it that no precipitate of copper sulphide is obtained when \(H_2S(g)\) is passed through this solution?

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.

Draw all the isomers (geometrical and optical) of:
(i) \([CoCl_2(en)_2]^{+}\)
(ii)\( [Co(NH_3)Cl(en)_2] ^{2+} \)
(iii)\( [Co(NH_3)_2Cl_2(en)]^{+}\)

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)

List of top Chemistry Questions on Coordination Compounds asked in CBSE CLASS XII

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