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Chapters
2: Solutions
3: Electrochemistry
4: Chemical Kinetics
5: Surface Chemistry
6: General Principle and Processes of Isolation of Elements
7: The p-block Elements
8: The d-and f-Block Elements
▶ 9: Coordination Compounds
10: Haloalkanes and Haloarenes
11: Alcohols, Phenols and Ethers
12: Aldehydes, Ketones and Carboxylic Acids
13: Amines
14: Biomolecules
15: Polymers
16: Chemistry In Everyday Life
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Solutions for Chapter 9: Coordination Compounds
Below listed, you can find solutions for Chapter 9 of CBSE NCERT Exemplar for Chemistry [English] Class 12.
NCERT Exemplar solutions for Chemistry [English] Class 12 9 Coordination Compounds Exercises [Pages 120 - 127]
Multiple Choice Questions (Type-I)
Which of the following complexes formed by \[\ce{Cu^2+}\] ions is most stable?
\[\ce{Cu^{2+} + 4NH3 ⇌ [Cu(NH3)4]^{2+}, logK = 11.6}\]
\[\ce{Cu^{2+} + 4CN^- ⇌ [Cu(CN)4]^{2-}, logK = 27.3}\]
\[\ce{Cu^{2+} + 2en ⇌ [Cu(en)2]^{2+}, logK = 15.4}\]
\[\ce{Cu^{2+} + 4H2O ⇌ [Cu(H2O)4]^{2+}, logK = 8.9}\]
The colour of the coordination compounds depends on the crystal field splitting. What will be the correct order of absorption of wavelength of light in the visible region, for the complexes, \[\ce{[Co(NH3)6]^{3+}}\], \[\ce{[Co(CN)6]^{3-}}\], \[\ce{[Co(H2O)6]^{3+}}\]
\[\ce{[Co(CN)_6]^{3-} > [Co(NH3)6]^{3+} > [Co(H2O)6]^{3+}}\]
\[\ce{[Co(NH3)_6]^{3+} > [Co(H2O)6]^{3+} > [Co(CN)6]^{3-}}\]
\[\ce{[Co(H2O)_6]^{3+} > [Co(NH3)6]^{3+} > [Co(CN)6]^{3-}}\]
\[\ce{[Co(CN)6]^{3-} > [Co(H2O)6]^{3+} > [Co(NH3)6]^{3+}}\]
When 0.1 mol \[\ce{CoCl3 (NH3)5}\] is treated with excess of \[\ce{AgNO3}\], 0.2 mol of \[\ce{AgCl}\] are obtained. The conductivity of solution will correspond to ______.
1:3 electrolyte
1:2 electrolyte
1:1 electrolyte
3:1 electrolyte
When 1 mol \[\ce{CrCl3.6H2O}\] is treated with excess of \[\ce{AgNO3}\], 3 mol of \[\ce{AgCl}\] are obtained. The formula of the complex is ______.
\[\ce{[CrCl3 (H2O)3].3H2O}\]
\[\ce{[CrCl2 (H2O)4]Cl.2H2O}\]
\[\ce{CrCl(H2O)5]Cl2.H2O}\]
\[\ce{[Cr(H2O)6]Cl3}\]
The correct \[\ce{IUPAC}\] name of \[\ce{[Pt(NH3)2Cl2]}\] is ______.
Diamminedichloridoplatinum (II)
Diamminedichloridoplatinum (IV)
Diamminedichloridoplatinum (0)
Dichloridodiammineplatinum (IV)
The stabilisation of coordination compounds due to chelation is called the chelate effect. Which of the following is the most stable complex species?
\[\ce{[Fe(CO)5]}\]
\[\ce{[Fe(CN)6]^{3-}}\]
\[\ce{[Fe(C2O4)3]^{3-}}\]
\[\ce{[Fe(H2O)6]^{3+}}\]
Indicate the complex ion which shows geometrical isomerism.
\[\ce{[Cr(H2O)4Cl2]^+}\]
\[\ce{[Pt(NH3)3Cl]}\]
\[\ce{[Co(NH3)6]^{3+}}\]
\[\ce{[Co(CN)5(NC)]^{3-}}\]
The CFSE for octahedral \[\ce{[CoCl6]^{4-}}\] is 18,000 cm–1. The CFSE for tetrahedral \[\ce{[CoCl4]^{2-}}\] will be ______.
18,000 cm–1
16,000 cm–1
8,000 cm–1
20,000 cm–1
Due to the presence of ambidentate ligands coordination compounds show isomerism. Palladium complexes of the type \[\ce{Pd(C6H5)2 (SCN)2]}\] and \[\ce{[Pd(C6H5)2 (NCS)2]}\] are ______.
linkage isomers
coordination isomers
ionisation isomers
geometrical isomers
The compounds \[\ce{[CO(SO4)(NH3)5]Br}\] and \[\ce{[Co(SO4)(NH3)5]Cl}\] represent
linkage isomerism
ionisation isomerism
coordination isomerism
no isomerism
A chelating agent has two or more than two donor atoms to bind to a single metal ion. Which of the following is not a chelating agent?
Thiosulphate
Oxalato
Glycinato
Ethane-1, 2-diamine
Which of the following species is not expected to be a ligand?
\[\ce{NO}\]
\[\ce{NH^{+}4}\]
\[\ce{NH2 CH2 CH2 NH2}\]
\[\ce{CO}\]
What kind of isomerism exists between \[\ce{[Cr(H2O)6]Cl3}\] (violet) and \[\ce{[Cr(H2O)5Cl]Cl2 . H2O}\] (greyish-green)?
Linkage isomerism
Solvate isomerism
Ionisation isomerism
Coordination isomerism
\[\ce{IUPAC}\] name of \[\ce{[Pt(NH3)2 Cl(NO2)]}\] is ______.
Platinum diaminechloronitrite
Chloronitrito-N-ammineplatinum (II)
Diamminechloridonitrito-N-platinum (II)
Diamminechloronitrito-N-platinate (II)
Multiple Choice Questions (Type-II) Note: In the following questions two or more options may be correct.
Atomic number of \[\ce{Mn}\], \[\ce{Fe}\] and \[\ce{Co}\] are 25, 26 and 27 respectively. Which of the following inner orbital octahedral complex ions are diamagnetic?
(i) \[\ce{[Co(NH3)6]^{3+}}\]
(ii) \[\ce{[Mn(CN)6]^{3-}}\]
(iii) \[\ce{[Fe(CN)6]^{4-}}\]
(iv) \[\ce{[Fe(CN)6]^{3-}}\]
Atomic number of \[\ce{Mn, Fe, Co}\] and Ni are 25, 26, 27 and 28 respectively. Which of the following outer orbital octahedral complexes have same number of unpaired electrons?
(i) \[\ce{[MnCl6]^{3-}}\]
(ii) \[\ce{[FeF6]^{3-}}\]
(iii) \[\ce{[CoF6]^{3-}}\]
(iv) \[\ce{[Ni(NH3)6]^{2+}}\]
Which of the following options are correct for \[\ce{[Fe(CN)6]^{3-}}\] complex?
(i) d2sp3 hybridisation
(ii) sp3d2 hybridisation
(iii) paramagnetic
(iv) diamagnetic
An aqueous pink solution of cobalt (II) chloride changes to deep blue on addition of excess of HCl. This is because:
(i) \[\ce{[Co(H2O)6]^{2+}}\] is transformed into \[\ce{[CoCl6]}^{4-}\]
(ii) \[\ce{[Co(H2O)6]^{2+}}\] is transformed into \[\ce{[CoCl4]}^{2-}\]
(iii) tetrahedral complexes have smaller crystal field splitting than octahedral complexes.
(iv) tetrahedral complexes have larger crystal field splitting than octahedral complex.
Which of the following complexes are homoleptic?
(i) \[\ce{[Co(NH3)6]^{3+}}\]
(ii) \[\ce{[Co(NH3)4 Cl2]^{+}}\]
(iii) \[\ce{[Ni(CN)4]^{2-}}\]
(iv) \[\ce{[Ni(NH3)4Cl2]}\]
Which of the following complexes are heteroleptic?
(i) \[\ce{[Cr(NH3)6]^{3+}}\]
(ii) \[\ce{[Fe(NH3)4]Cl2]^+}\]
(iii) \[\ce{[Mn(CN)6]^{4-}}\]
(iv) \[\ce{[Co(NH3)4]Cl2]}\]
Identify the optically active compounds from the following:
(i) \[\ce{[Co(en)3]^{3+}}\]
(ii) \[\ce{[trans - [Co(en)2Cl2]^+}\]
(iii) \[\ce{cis - [Co(en)2Cl2]^+}\]
(iv) \[\ce{[Cr(NH3)5Cl]}\]
Identify the correct statements for the behaviour of ethane-1, 2-diamine as a ligand.
(i) It is a neutral ligand.
(ii) It is a didentate ligand.
(iii) It is a chelating ligand.
(iv) It is a unidentate ligand.
Which of the following complexes show linkage isomerism?
(i) \[\ce{[Co(NH3)5 (NO2)]^{2+}}\]
(ii) \[\ce{Co(H2O)5 CO]^{3+}}\]
(iii) \[\ce{[Cr(NH3)5 SCN]^{2+}}\]
(iv) \[\ce{Fe(en)2 Cl2]^+}\]
Short Answer Type
Arrange the following complexes in the increasing order of conductivity of their solution:
[Co(NH3)3Cl3], [Co(NH3)4Cl2]Cl, [Co(NH3)6]Cl3, [Cr(NH3)5Cl]Cl2
A coordination compound \[\ce{CrCl3.4H2O}\] precipitates silver chloride when treated with silver nitrate. The molar conductance of its solution corresponds to a total of two ions. Write structural formula of the compound and name it.
A complex of the type \[\ce{[M(AA)2X2]^{n+}}\] is known to be optically active. What does this indicate about the structure of the complex? Give one example of such complex.
Magnetic moment of \[\ce{[MnCl4]^{2-}}\] is 5.92 BM. Explain giving reason.
On the basis of crystal field theory explain why Co(III) forms paramagnetic octahedral complex with weak field ligands whereas it forms diamagnetic octahedral complex with strong field ligands.
Why are low spin tetrahedral complexes not formed?
Give the electronic configuration of the following complexes on the basis of Crystal Field Splitting theory.
\[\ce{[CoF6]^{3-}, [Fe(CN)6]^{4-} and [Cu(NH3)6]^{2+}}\].
Explain why \[\ce{[Fe(H2O)6]^{3+}}\] has magnetic moment value of 5.92 BM whereas \[\ce{[Fe(CN)6]^{3-}}\] – has a value of only 1.74 BM.
Arrange following complex ions in increasing order of crystal field splitting energy (∆O):
\[\ce{[Cr(Cl)6]^{3-}, [Cr(CN)6]^{3-}, [Cr(NH3)6]^{3+}}\].
Why do compounds having similar geometry have different magnetic moment?
\[\ce{CuSO4 . 5H2O}\] is blue in colour while \[\ce{CuSO4}\] is colourless. Why?
Name the type of isomerism when ambidentate ligands are attached to central metal ion. Give two examples of ambidentate ligands.
Matching Type Note: In the following questions match the items given in Columns I and II.
Match the complex ions given in Column I with the colours given in Column II and assign the correct code:
| Column I (Complex ion) | Column II (Colour) |
| A. \[\ce{[Co(NH3)6]^{3+}}\] | 1. Violet |
| B. \[\ce{[Ti(H2O)6]^{3+}}\] | 2. Green |
| C. \[\ce{[Ni(H2O)6]^{2+}}\] | 3. Pale blue |
| D. \[\ce{(Ni(H2O)4 (en)]^{2+} (aq)}\] | 4. Yellowish orange |
| 5. Blue |
A - (1), B - (2), C - (4), D - (5)
A - (4), B - (3), C - (2), D - (1)
A - (3), B - (2), C - (4), D - (1)
A - (4), B - (1), C - (2), D - (3)
Match the coordination compounds given in Column I with the central metal atoms given in Column II and assign the correct code:
| Column I (Coordination Compound) | Column II (Central metal atom) |
| A. Chlorophyll | 1. rhodium |
| B. Blood pigment | 2. cobalt |
| C. Wilkinson catalyst | 3. calcium |
| D. Vitamin B12 | 4. iron |
| 5. magnesium |
A - (5), B - (4), C - (1), D - (2)
A - (3), B - (4), C - (5), D - (1)
A - (4), B - (3), C - (2), D - (1)
A - (3), B - (4), C - (1), D - (2)
Match the complex ions given in Column I with the hybridisation and number of unpaired electrons given in Column II and assign the correct code:
| Column I (Complex ion) | Column II (Hybridisation, number of unpaired electrons) |
| A. \[\ce{[Cr(H2O)6]^{3+}}\] | 1. dsp2, 1 |
| B. \[\ce{[Co(CN)4]^{2-}}\] | 2. sp3d2, 5 |
| C. \[\ce{[Ni(NH3)6]^{2+}}\] | 3. d2sp3, 3 |
| D. \[\ce{[MnF6]^{4-}}\] | 4. sp3, 4 |
| 5. sp3d2, 2 |
A - (3), B - (1), C - (5), D - (2)
A - (4), B - (3), C - (2), D - (1)
A - (3), B - (2), C - (4), D - (1)
A - (4), B - (1), C - (2), D - (3)
Match the complex species given in Column I with the possible isomerism given in Column II and assign the correct code:
| Column I (Complex species) | Column II (Isomerism) |
| A. \[\ce{[Co(NH3)4 Cl2]^+}\] | 1. optical |
| B. \[\ce{cis-[Co(en)2 Cl2]^+}\] | 2. ionisation |
| C. \[\ce{[Co(NH3)5 (NO2)]Cl2}\] | 3. coordination |
| D. \[\ce{[Co(NH3)6][Cr(CN)6]}\] | 4. geometrical |
| 5. linkage |
A - (1), B - (2), C - (4), D - (5)
A - (4), B - (3), C - (2), D - (1)
A - (4), B - (1), C - (5), D - (3)
A - (4), B - (1), C - (2), D - (3)
Match the compounds given in Column I with the oxidation state of cobalt present in it (given in Column II) and assign the correct code:
| Column I (Compound) | Column II (Oxidation state of Co) |
| A. \[\ce{[Co(NCS)(NH3)5](SO3)}\] | 1. + 4 |
| B. \[\ce{[Co(NH3)4 CL2]SO4}\] | 2. 0 |
| C. \[\ce{Na4[Co(S2O3)3]}\] | 3. + 1 |
| D. \[\ce{[Co2(CO)8]}\] | 4. + 2 |
| 5. + 3 |
A - (1), B - (2), C - (4), D - (5)
A - (4), B - (3), C - (2), D - (1)
A - (5), B - (1), C - (4), D - (2)
A - (4), B - (1), C - (2), D - (3)
Assertion and Reason Type Note: In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion: Toxic metal ions are removed by the chelating ligands.
Reason: Chelate complexes tend to be more stable.
Assertion and reason both are true, reason is correct explanation of assertion.
Assertion and reason both are true but reason is not the correct explanation of assertion.
Assertion is true, reason is false.
Assertion is false, reason is true.
Assertion: \[\ce{Cr(H2O)6]Cl2 and [Fe(H2O)6]Cl2}\] are reducing in nature.
Reason: Unpaired electrons are present in their d-orbitals.
Assertion and reason both are true, reason is correct explanation of assertion.
Assertion and reason both are true but reason is not the correct explanation of assertion.
Assertion is true, reason is false.
Assertion is false, reason is true.
Assertion: Linkage isomerism arises in coordination compounds containing ambidentate ligand.
Reason: Ambidentate ligand has two different donor atoms
Assertion and reason both are true, reason is correct explanation of assertion.
Assertion and reason both are true but reason is not the correct explanation of assertion.
Assertion is true, reason is false.
Assertion is false, reason is true.
Assertion: Complexes of MX6 and MX5L type (X and L are unidentate) do not show geometrical isomerism.
Reason: Geometrical isomerism is not shown by complexes of coordination number 6.
Assertion and reason both are true, reason is correct explanation of assertion.
Assertion and reason both are true but reason is not the correct explanation of assertion.
Assertion is true, reason is false.
Assertion is false, reason is true.
Assertion: \[\ce{[Fe(CN)6]^{3-}}\] ion shows magnetic moment corresponding to two unpaired electrons.
Reason: Because it has d2sp3 type hybridisation.
Assertion and reason both are true, reason is correct explanation of assertion.
Assertion and reason both are true but reason is not the correct explanation of assertion.
Assertion is true, reason is false.
Assertion is false, reason is true.
Long Answer Type
Using crystal field theory, draw energy level diagram, write electronic configuration of the central metal atom/ion and determine the magnetic moment value in the following:
\[\ce{[CoF6]^{3-}, [Co(H2O)6]^{2+}, [Co(Cn)6]^{3-}}\]
Using crystal field theory, draw energy level diagram, write electronic configuration of the central metal atom/ion and determine the magnetic moment value in the following:
\[\ce{[FeF6]^{3-}, [Fe(H2O)6]^{2+}, [Fe(CN)6]^{4-}}\]
Using valence bond theory, explain the following in relation to the complexes given below:
\[\ce{[Mn(CN)6]^{3-}}\]
(i) Type of hybridisation.
(ii) Inner or outer orbital complex.
(iii) Magnetic behaviour.
(iv) Spin only magnetic moment value.
Using valence bond theory, explain the following in relation to the complexes given below:
\[\ce{[Co(NH3)6]^{3+}}\]
(i) Type of hybridisation.
(ii) Inner or outer orbital complex.
(iii) Magnetic behaviour.
(iv) Spin only magnetic moment value.
Using valence bond theory, explain the following in relation to the complexes given below:
\[\ce{[Cr(H2O)6]^{3+}}\]
(i) Type of hybridisation.
(ii) Inner or outer orbital complex.
(iii) Magnetic behaviour.
(iv) Spin only magnetic moment value.
Using valence bond theory, explain the following in relation to the complexes given below:
\[\ce{[FeCl6]^{4-}}\]
(i) Type of hybridisation.
(ii) Inner or outer orbital complex.
(iii) Magnetic behaviour.
(iv) Spin only magnetic moment value.
CoSO4Cl.5NH3 exists in two isomeric forms ‘A’ and ‘B’. Isomer ‘A’ reacts with AgNO3 to give white precipitate, but does not react with BaCl2. Isomer ‘B’ gives white precipitate with BaCl2 but does not react with AgNO3. Answer the following questions.
- Identify ‘A’ and ‘B’ and write their structural formulas.
- Name the type of isomerism involved.
- Give the IUPAC name of ‘A’ and ‘B’.
What is the relationship between observed colour of the complex and the wavelength of light absorbed by the complex?
Why are different colours observed in octahedral and tetrahedral complexes for the same metal and same ligands?
Solutions for 9: Coordination Compounds
NCERT Exemplar solutions for Chemistry [English] Class 12 chapter 9 - Coordination Compounds
Shaalaa.com has the CBSE Mathematics Chemistry [English] Class 12 CBSE solutions in a manner that help students grasp basic concepts better and faster. The detailed, step-by-step solutions will help you understand the concepts better and clarify any confusion. NCERT Exemplar solutions for Mathematics Chemistry [English] Class 12 CBSE 9 (Coordination Compounds) include all questions with answers and detailed explanations. This will clear students' doubts about questions and improve their application skills while preparing for board exams.
Further, we at Shaalaa.com provide such solutions so students can prepare for written exams. NCERT Exemplar textbook solutions can be a core help for self-study and provide excellent self-help guidance for students.
Concepts covered in Chemistry [English] Class 12 chapter 9 Coordination Compounds are Introduction of Coordination Compounds, Definitions of Some Important Terms Pertaining to Coordination Compounds, Nomenclature of Coordination Compounds - Naming of Mononuclear Coordination Compounds, Bonding in Coordination Compounds - Introduction, Werner’s Theory of Coordination Compounds, Valence Bond Theory (VBT), Stereoisomerism, Nomenclature of Coordination Compounds - Formulas of Mononuclear Coordination Entities, Structural Isomerism, Isomerism in Coordination Compounds, Coordination Compounds Numerical, Types of Ligands, Magnetic Properties of Coordination Compounds, Crystal Field Theory (CFT), Colour in Coordination Compounds, Bonding in Metal Carbonyls, Stability of Coordination Compounds, Importance and Applications of Coordination Compounds.
Using NCERT Exemplar Chemistry [English] Class 12 solutions Coordination Compounds exercise by students is an easy way to prepare for the exams, as they involve solutions arranged chapter-wise and also page-wise. The questions involved in NCERT Exemplar Solutions are essential questions that can be asked in the final exam. Maximum CBSE Chemistry [English] Class 12 students prefer NCERT Exemplar Textbook Solutions to score more in exams.
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