Coordination Compounds — CBSE Class 12 board PYQs

The magnetic moment of [NiCl${}_4$]${}^{2-}$ is [Atomic number: Ni = 28]

Write the coordination number and oxidation state of platinum in the complex [Pt(en)${}_2$Cl${}_2$].

Write the IUPAC name of [Pt(NH${}_3$)${}_4$Cl${}_2$]Cl${}_2$.

Give an example of linkage isomerism.

Describe briefly the isomerism shown by [Cr(H${}_2$O)${}_5$(NCS)]${}^{2+}$.

Write the IUPAC name of [Ni(H${}_2$O)${}_6$](ClO${}_4$)${}_2$.

Give the IUPAC name of (NH${}_4$)${}_3$[Co(ONO)${}_6$].

Name the following complex using IUPAC norms: [Co(en)${}_2$(ONO)Cl]Cl.

Write the IUPAC name of the complex [Co(NH${}_3$)${}_5$SCN]Cl${}_2$.

Write the IUPAC name of the complex [Cr(H${}_2$O)${}_5$Cl]Cl${}_2$.

Write the IUPAC name of the complex Na${}_3$[Cr(OH)${}_2$F${}_4$].

Name an ionisation isomer of [Cr(H${}_2$O)${}_5$Br]SO${}_4$.

Name the type of isomerism exhibited by the following isomers:
[Pt(NH${}_3$)${}_4$][PtCl${}_6$] and [Pt(NH${}_3$)${}_4$Cl${}_2$][PtCl${}_4$]

What is the coordination number of the central metal ion in [Fe(C${}_2$O${}_4$)${}_3$]${}^{3-}$?

Write the IUPAC name for one of the isomers of [Co(NH${}_3$)${}_5$NO${}_2$]${}^{2+}$.

Write the IUPAC name for any one of the isomers of [Cr(NH${}_3$)${}_4$Cl${}_2$]${}^{+}$.

Write the IUPAC name of [Co(NH${}_3$)${}_5$Cl]Cl${}_2$.

Write the IUPAC name of [Co(en)${}_2$(NH${}_3$)${}_2$]Cl${}_3$.

Write the IUPAC name for any one of the isomers with the molecular formula [Pt(NH${}_3$)${}_2$Cl${}_2$]Cl${}_2$.

Give the formulae of the following compounds:
(a) Potassium tetrahydroxidozincate(II)
(b) Hexaammineplatinum(IV) chloride

Write the IUPAC name of the complex [Pt(en)${}_2$Cl${}_2$]. Draw the structures of the geometrical isomers of this complex.

Using IUPAC names, write the formulae for the following:
(i) Hexaamminecobalt(III) sulphate
(ii) Potassium trioxalatochromate(III)

Out of [CoF${}_6$]${}^{3-}$ and [Co(en)${}_3$]${}^{3+}$, which complex is:
(i) paramagnetic
(ii) more stable
(iii) an inner-orbital complex
(iv) a high-spin complex
(Atomic number of Co = 27)

Using IUPAC norms, write the formulae for the following:
(a) Sodium dicyanidoaurate(I)
(b) Tetraamminechloridonitrito-N-platinum(IV) sulphate

(a) What type of isomerism is shown by the complex [Co(NH${}_3$)${}_5$(SCN)]${}^{2+}$?
(b) Why is [NiCl${}_4$]${}^{2-}$ paramagnetic while [Ni(CN)${}_4$]${}^{2-}$ is diamagnetic? (Atomic number of Ni = 28)
(c) Why are low-spin tetrahedral complexes rarely observed?

When the coordination compound NiCl${}_2\cdot$6H${}_2$O is mixed with AgNO${}_3$, 2 moles of AgCl are precipitated per mole of the compound. Write:
i) the structural formula of the complex
ii) the IUPAC name of the complex

i) For the complex [Fe(CN)${}_6$]${}^{4-}$, write the hybridisation, magnetic character and spin type of the complex. (Atomic number: Fe = 26)
ii) Draw one of the geometrical isomers of the complex [Co(en)${}_2$Cl${}_2$]${}^{+}$ which is optically active.

i) Write the IUPAC name of the following complex: [Cr(NH${}_3$)${}_2$Cl${}_2$(en)]Cl (en = ethylenediamine).
ii) Write the formula of the complex pentaamminenitrito-O-cobalt(III).

When the coordination compound CrCl${}_3\cdot$6H${}_2$O is mixed with AgNO${}_3$, 2 moles of AgCl are precipitated per mole of the compound. Write:
i) the structural formula of the complex
ii) the IUPAC name of the complex

i) Draw the geometrical isomers of the complex [Pt(NH${}_3$)${}_2$Cl${}_2$].
ii) On the basis of crystal field theory, write the electronic configuration for a d⁴ ion if Δ${}_0$ < P.
iii) Write the hybridisation and magnetic behaviour of the complex [Ni(CO)${}_4$]. (Atomic number of Ni = 2 …

Explain the terms, giving a suitable example in each case:
i) ambident ligand
ii) denticity of a ligand
iii) crystal field splitting in an octahedral field

Write the structures and names of all the stereoisomers of the following compounds:
i) [Co(en)${}_3$]Cl${}_3$
ii) [Pt(NH${}_3$)${}_2$Cl${}_2$]
iii) [Fe(NH${}_3$)${}_4$Cl${}_2$]Cl

Write the name, stereochemistry and magnetic behaviour of the following: (Atomic numbers: Mn = 25, Co = 27, Ni = 28)
i) K${}_4$[Mn(CN)${}_6$]
ii) [Co(NH${}_3$)${}_5$Cl]Cl${}_2$
iii) K${}_2$[Ni(CN)${}_4$]

Name the following coordination compounds according to the IUPAC system of nomenclature:
i) [Co(NH${}_3$)${}_4$(H${}_2$O)Cl]Cl${}_2$
ii) [CrCl${}_2$(en)${}_2$]Cl (en = ethane-1,2-diamine)

Using the valence bond theory, predict the geometry and magnetic behaviour of [CoF${}_6$]${}^{3-}$. (Atomic number of Co = 27)

Compare the following complexes with respect to their structural shapes, magnetic behaviour and the hybrid orbitals involved:
[Co(NH${}_3$)${}_6$]${}^{3+}$, [Cr(NH${}_3$)${}_6$]${}^{3+}$, Ni(CO)${}_4$
(Atomic numbers: Co = 27, Cr = 24, Ni = 28)

Giving a suitable example for each, explain the following:
i) crystal field splitting
ii) linkage isomerism
iii) ambidentate ligand

For the complex [Fe(en)${}_2$Cl${}_2$]Cl (en = ethylenediamine), identify:
i) the oxidation number of iron
ii) the hybrid orbitals and the shape of the complex
iii) the magnetic behaviour of the complex
iv) the number of geometrical isomers
v) whether there is an optical isomer also …

a) What is the basis of the formation of the spectrochemical series?
b) Draw the structures of the geometrical isomers of the following coordination complexes:
[Co(NH${}_3$)${}_3$Cl${}_3$] and [CoCl${}_2$(en)${}_2$]${}^{+}$

a) What is a ligand? Give an example of a bidentate ligand.
b) Explain how the two complexes of nickel, [Ni(CN)${}_4$]${}^{2-}$ and Ni(CO)${}_4$, have different structures but do not differ in their magnetic behaviour. (Ni = 28)

a) Illustrate the following with an example each:
i) linkage isomerism
ii) coordination isomerism
b) Why is [NiCl${}_4$]${}^{2-}$ paramagnetic? (Ni = 28)

Describe, for any two of the following complex ions, the type of hybridisation, shape and magnetic property:
i) [Fe(H${}_2$O)${}_6$]${}^{2+}$
ii) [Co(NH${}_3$)${}_6$]${}^{3+}$
iii) [NiCl${}_4$]${}^{2-}$
(Atomic numbers: Fe = 26, Co = 27, Ni = 28)

Write the name and draw the structure of each of the following complex compounds:
i) [Co(NH${}_3$)${}_4$(H${}_2$O)${}_2$]Cl${}_3$
ii) [Pt(NH${}_3$)${}_4$][NiCl${}_4$]

Draw the structures of the following:
i) cis-dichloridotetracyanidochromate(III)
ii) pentaamminenitrito-N-cobalt(III)

a) What are ambidentate ligands? Give an example.
b) Write the IUPAC names of the following:
i) K${}_3$[Fe(C${}_2$O${}_4$)${}_3$] ii) [Pt(NH${}_3$)${}_6$]Cl${}_4$
c) Draw the structure of the cis-isomer of [Co(NH${}_3$)${}_4$Cl${}_2$]${}^{+}$.

Write the name (IUPAC norms) and draw the possible optical isomers of [CrCl${}_2$(en)(NH${}_3$)${}_2$]${}^{+}$.

a) Using valence bond theory, predict the geometry and magnetic character of [Cr(NH${}_3$)${}_6$]${}^{3+}$. [Cr = 24]
b) Give one example of the application of coordination compounds in medicine.

Draw a sketch to show the splitting of d-orbitals in an octahedral crystal field. State, for a d⁶ ion, how the actual configuration of the split d-orbitals in an octahedral crystal field is decided by the relative values of Δ${}_0$ and P.

Write the IUPAC name and draw the structure of the coordination entity of [PtCl(NH${}_3$)${}_5$]Cl${}_3$.

How is the magnitude of Δ${}_0$ affected by (i) the nature of the ligand and (ii) the oxidation state of the metal ion?

a) Write the IUPAC name of the ionisation isomer of [Ni(NH${}_3$)${}_5$NO${}_3$]Cl.
b) How are coordination compounds useful in biological processes? (Give two uses.)

a) Write the formulae of the following complexes:
i) Hexaammineplatinum(IV) chloride
ii) Dichloridotetraamminecobalt(III) ion
b) The dissociation constants of [Cu(NH${}_3$)${}_4$]${}^{2+}$ and [Co(NH${}_3$)${}_6$]${}^{3+}$ are 1.0 × 10⁻¹² and 6.2 × 10⁻³⁶ respectively. Which complex is more s …

Write the IUPAC name of [Co(en)${}_2$Cl${}_2$]Cl and draw the structures of all the isomers of this complex.

a) Give the IUPAC name of [PtCl(NH${}_2$CH${}_3$)(NH${}_3$)${}_2$]Cl.
b) Compare the magnetic behaviour of the complex entities [Fe(CN)${}_6$]${}^{4-}$ and [FeF${}_6$]${}^{3-}$. (Atomic number of Fe = 26)

Using the valence bond approach, deduce the shape and magnetic behaviour of the [Cr(NH${}_3$)${}_6$]${}^{3+}$ ion. [Atomic number of Cr = 24]

Using the valence bond approach, predict the shape and magnetic behaviour of [CoCl${}_4$]${}^{2-}$. (Atomic number of Co = 27)

Using the valence bond approach, deduce the shape and magnetic character of [Co(NH${}_3$)${}_6$]${}^{3+}$. (Atomic number of Co = 27)

Using the valence bond approach, predict the shape and magnetic character of the [Fe(CN)${}_6$]${}^{3-}$ ion. (Atomic number of Fe = 26)

Using the valence bond approach, deduce the shape and magnetic character of [Cr(CO)${}_6$]. [Atomic number of Cr = 24]

Answer the following:
a) Differentiate between a bidentate ligand and a monodentate ligand.
b) Write the IUPAC name of [Pt(NH${}_3$)${}_4$Cl${}_2$]Cl${}_2$.
c) Draw the structures of the geometrical isomers of [Co(NH${}_3$)${}_4$Cl${}_2$]${}^{+}$.

a) A coordination compound has the formula CoCl${}_3\cdot$4NH${}_3$. It does not liberate ammonia but precipitates chloride with AgNO${}_3$ (one mole AgCl per mole of compound). Write the structure and IUPAC name of the complex compound.
b) Name a ligand which is bidentate and give an …

a) Write the chemical formulae of the following complexes:
i) Hexaammineplatinum(IV) chloride
ii) Tetraamminedichloridocobalt(III) ion
b) Using the valence bond theory of bonding in complexes, explain the geometry and magnetic nature of [Co(NH${}_3$)${}_6$]${}^{3+}$.

Explain the following observation:
Tetrahedral Ni(II) complexes are paramagnetic but square planar Ni(II) complexes are diamagnetic.

Deduce the shape and magnetic behaviour of the complex ion [Co(NH${}_3$)${}_5$NO${}_2$]${}^{2+}$. [Atomic number of Co = 27]

Illustrate with an example ionisation isomerism in coordination compounds.

a) Name two main factors that favour a metal ion forming a complex.
b) Give an example of an industrial application of the formation of a coordination complex.
c) Write the IUPAC name of [Co(en)${}_2$Cl(ONO)]${}^{+}$.

Explain the following:
i) [Co(NH${}_3$)${}_6$]${}^{3+}$ is diamagnetic, whereas [CoF${}_6$]${}^{3-}$ is paramagnetic.
ii) [Fe(H${}_2$O)${}_6$]${}^{3+}$ is more paramagnetic than [Fe(CN)${}_6$]${}^{3-}$.

Among [Ag(NH${}_3$)${}_2$]Cl, [Ni(CN)${}_4$]${}^{2-}$ and [CuCl${}_4$]${}^{2-}$, which:
i) has square planar geometry?
ii) remains colourless in aqueous solution, and why?
[Atomic numbers: Ag = 47, Ni = 28, Cu = 29]

Using the valence bond theory, predict the shape and magnetic behaviour of the [Cr(NH${}_3$)${}_5$Cl]${}^{2+}$ ion. [Atomic number of Cr = 24]

(a) Which of the following species cannot act as a ligand? Give a reason.
OH⁻, NH${}_4^{+}$, CH${}_3$NH${}_2$, H${}_2$O
(b) The complex [Co(NH${}_3$)${}_5$(NO${}_2$)]Cl${}_2$ is red in colour. Give the IUPAC name of its linkage isomer.

a) For the complex [Fe(CN)${}_6$]${}^{3-}$, write the hybridisation type, magnetic character and spin nature. (Atomic number: Fe = 26)
b) Draw one of the geometrical isomers of the complex [Pt(en)${}_2$Cl${}_2$]${}^{2+}$ which is optically active.

(a) Write the formula of the coordination compound iron(III) hexacyanidoferrate(II).
(b) What type of isomerism is exhibited by the complex [Co(NH${}_3$)${}_5$Cl]SO${}_4$?
(c) Write the hybridisation and the number of unpaired electrons in the complex [CoF${}_6$]${}^{3-}$. (Atomic number o …