Coordination compounds are a crucial topic in chemistry for Class 12 students. This resource provides previous year questions that help students practice and prepare for their exams. Topics include hybridization, isomerism, and magnetic behavior of various coordination complexes. Ideal for students aiming to excel in their chemistry examinations, this collection covers essential concepts and problem-solving techniques.

Key Points

  • Includes previous year questions on coordination compounds for Class 12 chemistry.
  • Covers topics like hybridization, isomerism, and magnetic properties of complexes.
  • Helps students prepare effectively for their chemistry exams.
  • Focuses on practical problem-solving and conceptual understanding.
Nandini Raj
5 pages
Language:English
Type:Past Paper
Biology
Nandini Raj
5 pages
Language:English
Type:Past Paper
Biology
Nandini Raj
5 pages
Language:English
Type:Past Paper
Biology
307

Coordination Compounds Previous Year Questions for Class 12 pdf

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PREVIOUS YEAR QUESTIONS
COORDINATION COMPOUNDS
1. Write the state of hybridisation, the shape and the magnetic behaviour of the following complex entities
(i) [Cr(NH
3
)
4
Cl
2
]Cl (ii) [Co(en)
3
]Cl
3
(iii) K
2
[Ni(CN)
4
]
[March 2011] [3]
2. Write the structure and name of 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
[March 2011] [3]
3. Explain the following terms with suitable examples
(i) Ambident ligand
(ii) Denticity of a ligand
(iii) Crystal field splitting in an Oh field [March 2011] [3]
4. Write the name, the structure and the magnetic behaviour of each one of the following complexes
(i) [Pt(NH
3
)Cl(NO
2
)] (ii) [Co(NH
3
)
4
Cl
2
]Cl (iii) [Ni(CO)
4
]
(At. nos Co = 27, Ni = 28, Pt = 78) [March 2012] [3]
5. Name the following coordination entities and describe their structures:
(i) [Fe(CN)
6
]
4−
(ii) [Cr(NH
3
)
4
Cl
2
]
+
(iii) [Ni(CN)
4
]
2−
(Atomic numbers Fe = 26, Cr = 24, Ni = 28) [March 2012] [3]
6. [Fe(H
2
O)
6
]
3+
is strongly paramagnetic whereas [Fe(CN)
6
]
3−
is weakly paramagnetic. Explain
[At. No. Fe = 26] [March 2012] [2]
7. ndicate the types of isomerisms exhibited by the complex
[Co(NH
3
)
5
(NO
2
)] (NO
3
)
2
. (At. no Co = 27) [March 2012] [1]
8. Give the formula of each of the following coordination entities
(i) Co
3+
ion is bound to one Cl
−
, one NH
3
molecule and two bidentate ethylene diamine (en) molecules
(ii) Ni
2+
ion is bound to two water molecules and two oxalate ions
Write the name and magnetic behaviour of each of the above coordination entities?
(At. numbers. Co = 27, Ni = 28) [March 2012] [2]
9. Name the following coordination entities and draw the structures of their stereoisomers:
(i) [Co(en)
2
Cl
2
]
+
(en = ethane-1,2-diamine)
(ii) [Cr(C
2
O
4
)
3
]
3−
(iii) [Co(NH
3
)
3
Cl
3
] [March 2012] [3]
10. How is the stability of a coordination compound in solution decided? How is the dissociation constant of a complex
defined? [March 2012] [2]
11. Give UPAC name of ionization isomer of [Ni(NH
3
)
5
NO
3
]Cl [March 2012] [1]
12. Write the types of isomerism exhibited by the following complexes: [Co(NH
3
)
5
Cl]SO
4
[March 2013] [1]
13. Write the UPAC names of the following coordination compounds
(i) [Cr(NH
3
)
3
Cl
3
]
(ii) K
3
[Fe(CN)
6
]
(iii) [CoBr
2
(en)
2
]
+
, (en = ethylene diammine) [March 2013] [3]
14. For the complex [NiCl
4
]
2−
, write
(i) the UPAC name
(ii) the hybridization type
(iii) the shape of the complex
(Atomic no. of Ni = 28)
[OR]
What is meant by crystal field splitting energy? On the basis of crystal field theory, write the electronic configuration
of d
4
in terms of t
2g
and e
g
in an octahedral field when
(i)
0
> P
(ii)
0
< P [March 2013] [3]
15. Write the types of isomerisation exhibited by the following complexes - [Co(NH
3
)
5
Cl]SO
4
[March 2014] [1]
16. Write the UPAC name of the complex [Cr(NH
3
)
4
Cl
2
]
+
. What type of isomerism does it exhibit?
[March 2014] [1]
17. Which of the following is more stable complex and why?
[Co(NH
3
)
6
]
3+
and [Co(en)
3
]
3+
[March 2014] [1]
18. (i) Write the UPAC name of the complex (Cr(NH
3
)
4
Cl
2
]Cl
(ii) What types of isomerism is exhibited by the complex [Co(en)
3
]
3+
? (en = ethane-1,2-diamine)
(iii) Why is [NiCl
4
]
2−
paramagnetic but [Ni(CO)
4
] is diamagnetic?
[At. no. Cr = 24, Co = 27, Ni = 28] [March 2014] [3]
19. (a) Write the hybridization and shape of the following complexes:
(i) [Co(NH
3
)
6
]
3+
(ii) [NiCl
4
]
2−
(Atomic number : Co = 27, Ni = 28)
(b) Out of NH
3
and ‘en’, which ligand forms more stable complex with metal and why?
[March 2015] [3]
20. Write down the UPAC name of the complex [Co(NH
3
)
5
(CO
3
)Cl. What type of isomerism is shown by this complex?
[OR]
Using UPAC norms write the formulae for the following coordination compounds:
(i) Tetrachloridocuprate ()
(ii) Potassium tetrahydroxidozincate () [March 2015] [2]
21. When a coordination compound PdCl
2
.4NH
3
is mixed with AgNO
3
, 2 moles of AgCl are precipitated per mole of the
compound. Write:
(i) Structural formula of the complex
(ii) UPAC name of the complex [March 2016] [2]
22. (a) For the complex [CoF
6
]
3−
, write the hybridisation, magnetic character and spin of the complex.
(At. number: Co = 27)
(b) Draw one of the geometrical isomers of the complex [Co(en)
2
Cl
2
]
+
which is optically active.
[March 2016] [3]
23. Using UPAC norms write the formulae for the following:
(a) Tris(ethane-1,2-diamine)chromium () chloride
(b) Potassium tetrahydroxozincate () [March 2017] [2]
24. (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? [March 2017] [3]
25. Write the coordination number and oxidation state of Platinum in the complex [Pt(en)
2
Cl
2
]
[March 2018] [1]
26. (a) Write the formula of the following coordination compound:
ron() hexacyanoferrate ()
(b) What type of isomerism is exhibited by the complex [Co(NH
3
)
5
Cl]SO
4
?
(c) Write the hybridisation and number of unpaired electrons in the complex [CoF
6
]
3−
(Atomic No. of Co = 27) [March 2018] [3]
27. When a coordination compound CrCl
3
.6H
2
O is mixed with AgNO
3
, two moles of AgCl are precipitated per mole of the
compound. What is the structural formula of the coordination compound?
[March 2019] [1]
28. Write the hybridisation and magnetic character of the following complexes:
(a) [Fe(H
2
O)
6
]
2+
(b) [Ni(CN)
4
]
2−
[Atomic number : Fe = 26, Ni = 28] [March 2019] [3]
29. Assertion: Low-spin tetrahedral complexes are rarely observed
Reason: The orbital splitting energies are not sufficiently large to force pairing. [March 2020] [1]
30. (a) Give the IUPAC name and electronic configuration of central metal atom in terms of t
2g
and e
g
of
K
4
[Mn(CN)
6
]
(b) What is meant by ‘Chelate effect’? Give an example
OR
Write the hybridization and magnetic characters of the following complexes
(i)[Fe(CN)
6
]
4-
(ii) [CoF
6
]
3-
(iii) [Ni(CO)
4
] [March 2020][3]
[Atomic number: Fe = 26, Co = 27, Ni = 28]
31.Ambidentate ligands like NO
2
-
and SCN
-
are :
a) unidentate b) didentate c) polydentate d) has variable denticity
OR
The formula of the coordination compound Tetraammineaquachloridocobalt(III) chloride is
a) [Co(NH
3
)
4
(H
2
O)Cl]Cl
2
b) [Co(NH
3
)
4
(H
2
O)Cl]Cl
3
c) [Co(NH
3
)
2
(H
2
O)Cl]Cl
2
d) [Co(NH
3
)
4
(H
2
O)Cl]Cl [SQP 2021][1]
32. (i) Using crystal field theory, write the electronic configuration of iron ion in the following complex ion. Also predict its
magnetic behaviour : [Fe(H
2
O)
6
]
2+
(ii)Write the IUPAC name of the coordination complex: [CoCl
2
(en)
2
]NO
3
OR
(i)Predict the geometry of [Ni(CN)
4
]
2-
(ii)Calculate the spin only magnetic moment of [Cu(NH
3
)
4
]
2+
ion. [SQP 2021][3]
33.
[March 2022] [3]
34. The CFSE of [CoCl
6
]
3-
is 18000 cm
-1
the CFSE for [CoCl
4
]
-
will be:
a. 18000 cm
-1
b. 8000cm
-1
c. 2000 cm
-1
d. 16000 cm
-1
[SQP 2022][1]
35. The number of ions formed on dissolving one molecule of FeSO
4
.(NH
4
)
2
SO
4
.6H
2
O in water is:
a. 3 b. 4 c. 5 d. 6 [SQP 2022][1]
36. The formula Co(NH
3
)
5
CO
3
Cl could represent a carbonate or a chloride. Write the structures and names of possible
isomers. [SQP 2022] [2]
37. Using Valence bond theory, explain the following in relation to the paramagnetic complex [Mn(CN)
6
]
3-
a. type of
hybridization
b. magnetic moment value
c. type of complex – inner, outer orbital complex [SQP 2022][3]
38. What type of isomerism is shown by the following pair of complex compounds?
[Co(NH
3
)
6
][Cr(CN)
6
] and [Cr(NH
3
)
6
][Co(CN)
6
]
(a) Linkage isomerism (b) Hydrate isomerism
(c) Coordination isomerism (d) Ionisation isomerism [March 2023] [1]
39. In which of the following does the central atom exhibit an oxidation state of +4?
(a) K
2
[Ni(CN)
4
] (b) [Cu(NH
3
)
4
]
2+
(c) [Pt(NH
3
)
2
Cl
2
] (d) [Pt(en)
2
Cl
2
]
2+
[March 2023] [1]
40. Write the IUPAC names of the following coordination entities:
(a) [Cr(NH
3
)
3
(H
2
O)
3
]Cl
3
(b) K
3
[Al(C
2
O
4
)
3
] [March 2023] [2]
41. Answer any three of the following questions
(a) Explain the type of hybridization in [Fe(CN)
6
]
3-
on the basis of valence bond theory (Given Atomic number of Fe = 26)
(b) Draw the geometrical isomers of [PtCl
2
(en)
2
]
2+
(c) [NiCl
4
]
2-
is paramagnetic while [Ni(CO)
4
] is diamagnetic though both are tetrahedral. Why?
(d) Name the type of isomerism when ambidentate ligands are attached to the central metal ion. Give one example of an
ambidentate ligand. [March 2023] [3]
42. The compounds [Cr(H
2
O)
6
]Cl
3
, [Cr(H
2
O)
5
Cl]Cl
2
.H
2
O and [Cr(H
2
O)
4
Cl
2
]Cl.2H
2
O exhibit
(a) Linkage isomerism (b) Geometrical isomerism
(c) Ionisation isomerism (d) Hydrate isomerism [March 2023] [1]
43. Write the IUPAC names of the following coordination entities:
(a) [Co(en)
2
(H
2
O)(CN)]
2+
(b) [Ni(NH
3
)
6
]Cl
2
[March 2023] [2]
44. [Co(NH
3
)
5
NO
3
]SO
4
and [Co(NH
3
)
5
SO
4
]NO
3
exhibit:
(a) Linkage isomerism (b) Ionisation isomerism
(c) Optical isomerism (d) Coordination isomerism [March 2023] [1]
45. In which of the following does the central atom exhibit an oxidation state of +3?
(a) K
2
[Ni(CN)
4
] (b) K
4
[Fe(CN)
6
] (c) [Fe(C
2
O
4
)
3
]
3-
(d) [Cu(NH
3
)
4
]
2+
[March 2023] [1]
46. Write the IUPAC names of the following coordination entities:
(a) [Co(NH
3
)
4
Cl(NO
2
)]Cl
(b) [PtCl
2
(en)
2
]
2+
[March 2023] [2]
47. (a) Write the formula for the following coordination compound
Bis(ethane-1,2-diamine) dihydroxidochromium(III) chloride
(b) Does ionization isomer for the following compound exist? Justify your answer.
Hg[Co(SCN)
4
]
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End of Document
307

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[March 2022]
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FAQs

What is the hybridization of [NiCl4]2− and its shape?
The hybridization of [NiCl4]2− is sp3, and it has a tetrahedral shape. This is due to the coordination number of 4, which leads to the arrangement of the ligands around the nickel ion in a tetrahedral geometry.
How is the stability of a coordination compound in solution determined?
The stability of a coordination compound in solution is determined by its dissociation constant. A lower dissociation constant indicates higher stability, as it implies that the complex does not easily dissociate into its constituent ions.
What types of isomerism are exhibited by [Co(NH3)5Cl]SO4?
The complex [Co(NH3)5Cl]SO4 exhibits linkage isomerism and geometric isomerism. Linkage isomerism occurs due to the presence of ambidentate ligands, while geometric isomerism arises from the different spatial arrangements of the ligands around the cobalt ion.
What is the magnetic behavior of [Fe(H2O)6]3+?
The complex [Fe(H2O)6]3+ is strongly paramagnetic. This is due to the presence of unpaired electrons in the d-orbitals of the iron ion, which results in a net magnetic moment.
What is the IUPAC name of [Cr(NH3)4Cl2]+?
The IUPAC name of the complex [Cr(NH3)4Cl2]+ is tetraamminechlorochromium(III). This name reflects the ligands present and the oxidation state of the chromium ion.
Explain the term 'ambident ligand' with an example.
An ambident ligand is a type of ligand that can bind to a metal ion through two different atoms. For example, the thiocyanate ion (SCN−) can bind through either the sulfur or the nitrogen atom, making it ambident.
What is the electronic configuration of d4 in terms of t2g and eg in an octahedral field?
In an octahedral field, the electronic configuration of a d4 ion can be expressed as t2g^3 eg^1 when the crystal field splitting energy (Δ0) is greater than the pairing energy (P). Conversely, if Δ0 is less than P, the configuration would be t2g^2 eg^2.

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