CBSE Class 12 Chemistry Coordination Compounds Previous Year Question Paper 2021-22

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This document presents the CBSE Class 12 Chemistry Previous Year Question Paper focusing on Coordination Compounds for the 2021-22 session. It includes various question types such as Multiple Choice Questions (MCQs), Very Short Answer (VSA) questions, and Short Answer (SA) questions, covering topics like Werner's theory, definitions of terms, nomenclature, and isomerism in coordination compounds. Questions assess understanding of oxidation states, coordination numbers, complex stability, chelate effects, IUPAC naming, and different types of isomerism. Solving this board question paper is crucial for students to understand the exam pattern, identify important topics, and enhance their preparation for the CBSE board examinations.

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BoardCBSE
Class12
SubjectChemistry
Session2021-22
LanguageEnglish
TypePrevious Year Question Paper
Exam typeBoard Exam

Paper pattern

The paper includes MCQs, VSA (1 mark), SA I (2 marks), and SA II (3 marks) questions, assessing various aspects of coordination compounds.

Topics covered

Paper topics

  • Werner's Theory
  • Definitions of Coordination Compound Terms
  • Nomenclature of Coordination Compounds
  • Isomerism in Coordination Compounds
  • Coordination Number
  • Oxidation State
  • Chelate Effect
  • Ambidentate Ligands
  • Bidentate Ligands
  • Structural Isomerism
  • Linkage Isomerism
  • Ionisation Isomerism
  • Coordination Isomerism
  • Optical Isomerism

Important topics

  • Werner's Theory
  • Nomenclature of Coordination Compounds
  • Isomerism in Coordination Compounds
  • Coordination Number
  • Oxidation State
  • Stability of Complexes

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Question paper text

Coordination Compounds

Previous Years' CBSE Board Questions

5.1 Werner's Theory of Coordination Compounds

MCQ

1, Assertion: [Co(NH<sub>3</sub>)<sub>5</sub>SO<sub>4</sub>]Cl gives a white precipitate with silver nitrate solution.

Reason: The complex dissociates to give Cl and SO<sub>4</sub><sup>2</sup>- ions.

  1. Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
  2. Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
  3. Assertion (A) is true, but Reason (R) is false.

Assertion (A) is false, but Reason (R) is true.

(2023)

  1. One mole of CrCl<sub>3</sub>·6H<sub>2</sub>O compound reacts with excess AgNO<sub>3</sub> solution to yield two moles of AgCl<sub>(s)</sub>- The structural formula of the compound is
  2. <math>[Cr(H_2O)_5Cl]Cl_2 \cdot H_2O</math> (b) <math>[Cr(H_2O)_3Cl_3] \cdot 3H_2O</math>
  3. [Cr(H<sub>2</sub>O)<sub>4</sub>Cl<sub>2</sub>]Cl·2H<sub>2</sub>O (d) [Cr(H<sub>2</sub>O)<sub>6</sub>Cl<sub>2</sub>] (2020)

VSA (1 mark)

  1. When a coordination compound CrCl<sub>3</sub>·6H<sub>2</sub>O is mixed with AgNO<sub>3</sub>, 2 moles of AgCI are precipitated per mole of the compound. Write structural formula of the complex. (Al 2019, 1/2, Delhi 2016)
  2. What is the difference between a complex and a double salt? (Al 2019) R
  3. When a coordination compound CoCl3.6NH3 is mixed with AgNO<sub>3</sub>, 3 moles of AgCI are precipitated per mole of the compound. Write structural formula of the complex. (1/2, AI 2016)

5.2 Definition of Some Important Terms Pertaining to Coordination Compounds

MCQ

  1. The oxidation number of Co in [Co(en)<sub>3</sub>] 2(SO<sub>4</sub>)<sub>3</sub> is
  2. <math>+2</math> (b) <math>+3</math> <math>(c) +4</math> (d) +6 (2021C) Ap
  1. Which of the following ligands form a 'chelate' complex with metal ion?
  2. H<sub>2</sub>O (b) CN- (c) C2O4- (d) CI

(2021C)

  1. The coordination number of Cr in [CrCl<sub>2</sub>(ox)<sub>2</sub>]<sup>3-</sup> is
  2. 6 (b) 5 (c) 4 (d) 3

(2021C)

  1. The coordination number of 'Co' in the complex <math>[Co(en)_3]^{3+}</math> is
  1. 3 (b) 6 (c) 4 (d) 5 (2020) R

Assertion (A) : <math>[Pt(en)_2Cl_2]^{2+}</math> complex is less stable

than [Pt(NH<sub>3</sub>)<sub>4</sub>Cl<sub>2</sub>]<sup>2+</sup> complex.

Reason (R): [Pt(en)2Cl2]2+ complex shows chelate

effect. (a) Both Assertion (A) and Reason (R) are correct

statements, and Reason (R) is the correct

explanation of the Assertion (A). (b) Assertion (A) is correct, but Reason (R) is

incorrect statement.

Assertion (A) is incorrect, but Reason (R) is

correct statement. (2020)

The oxidation state of Ni in [Ni(CO)<sub>4</sub>] is

  1. 0 (b) 2
  2. 3 (d) 4 (2020) An

VSA (1 mark)

  1. Amongst [Fe(C2O4)3]3- and [Fe(NH3)6]3+, which is more stable and why? (2019C)
  2. Write the coordination number and oxidation state of platinum in the complex [Pt(en),Cl2]. (2018)
  3. Which of the following is more stable complex and why? <math>[Co(NH_3)_6]^{3+}</math> and <math>[Co(en)_3]^{3+}</math> (Delhi 2014)

Nomenclature of Coordination

Compounds

MCQ

The 15. formula of the coordination compound

tetraamminechloridonitrito-N-cobalt(III) chloride is:

(a) [Co(NH<sub>3</sub>)<sub>4</sub>CI(ONO)]Cl<sub>2</sub>

(b) [Co(NH<sub>3</sub>)<sub>4</sub>Cl<sub>2</sub>(NO<sub>2</sub>)]Cl

(c) [Co(NH<sub>3</sub>)<sub>4</sub>CI(NO<sub>2</sub>)]CI

(d) [Co(NH<sub>3</sub>)<sub>4</sub>(NO<sub>2</sub>)]Cl<sub>3</sub> (2021C)

VSA (1 mark)

  1. Write the formula of the following coordination compound: Iron(III) hexacyanidoferrate(II) (1/3, 2018)
  2. Write the IUPAC name of the following complex : <math>[Cr(NH3)3Cl3].</math> (1/3, Delhi 2017)
  3. Write the IUPAC name of the following complex: <math>[Co(NH3)5(CO3)]CI.</math> (1/3, Delhi 2017)

When a coordination compound CrCl<sub>3</sub>·6H<sub>2</sub>O is

mixed with AgNO3, 2 moles of AgCI are precipitated

per mole of the compound. Write IUPAC name of the

complex. (1/2, Delhi 2016) [An

SAI (2 marks)

  1. Give the formulae of the following compounds:
  2. Potassium tetrahydroxidozincate(II)
  3. Hexaammineplatinum(IV) chloride (2020) Ap
  1. Using IUPAC norms write the formulae for the following:
  2. Pentaamminenitrito-O-cobalt(III) chloride
  3. Potassium tetracyanidonickelate(II) (NCERT, Delhi 2019)

Isomerism in Coordination

Compounds

  1. Using IUPAC norms write the formulae for the following:
  2. Sodium dicyanidoaurate(I)
  3. Tetraamminechloridonitrito-N-platinum(IV) The compounds [Co(SO<sub>4</sub>)(NH<sub>3</sub>)<sub>5</sub>]Br and

sulphate (AI 2017) (a) optical isomerism

  1. Using IUPAC norms write the formulae for the (b) linkage isomerism

following: (c) ionisation isomerism (b)

  1. Tris(ethane-1,2,diamine)chromium(III) chloride (d) coordination isomerism. (2023)
  2. Potassium tetrahydroxozincate(II) (AI 2017) The pair [Co(NH<sub>3</sub>)<sub>4</sub>Cl<sub>2</sub>]Br<sub>2</sub> and [Co(NH<sub>3</sub>)<sub>4</sub>Br<sub>2</sub>]Cl<sub>2</sub> will show (a) linkage isomerism
  1. Using IUPAC norms write the formulae for the following:
  2. Potassium trioxalatoaluminate(III)
  3. Dichloridobis(ethane-1,2-diamine)cobalt(III) (Al 2017) Ap
  1. (i) Write down the IUPAC name of the following complex: <math>[Cr(NH_3)_2Cl_2(en)]Cl</math> (en = ethylenediamine)
  2. Write the formula for the following complex: Pentaamminenitrito-O-cobalt (III). (Delhi 2015)
  1. Using IUPAC norms write the formulae for the following coordination compounds:
  2. Hexaamminecobalt(III) chloride
  1. Potassium tetrachloridonickelate(II) (AI 2015)
  2. (i) Write down the IUPAC name of the following complex: [Cr(en)2]Cl2.
  3. Write the formula for the following complex: Potassium trioxalatochromate(III).

(Foreign 2015)

SA II (3 marks)

  1. (i) Write the IUPAC name of the following complex: <math>[Co(NH_3)_4(H_2O)CI]CI_2</math>
  2. What is the difference between an Ambidentate ligand and a Bidentate ligand?
  3. Out of <math>[Fe(NH_3)_6]^{3+}</math> and <math>[Fe(C_2O_4)_3]^{3-}</math>, which complex is more stable and why?

(Term II, 2021-22) U OR

Write the IUPAC name of the following:

  1. [Co(NH<sub>3</sub>)<sub>6</sub>]Cl<sub>3</sub> (ii) [NiCl<sub>a</sub>]<sup>2-</sup>
  2. K<sub>3</sub>[Fe(CN)<sub>6</sub>] (AI 2015C) (Ap)
  1. Write down the IUPAC name for each of the following complexes:
  2. [Co(NH<sub>3</sub>)<sub>5</sub>Cl]Cl<sub>2</sub> (ii) K<sub>3</sub>[Fe(CN)<sub>6</sub>]
  3. [NiCl<sub>4</sub>]<sup>2-</sup> (Delhi 2014C) U
  1. Write the IUPAC name and draw the structure of each of the following complex entities:
  1. Co (ii) [Cr(CO)<sub>6</sub>]
  2. [PtCl<sub>3</sub>(C<sub>2</sub>H<sub>4</sub>)]<sup>-</sup> (At. nos. Cr = 25, Co = 27, Pt = 78) (AI 2014C) (Cr

Structural Isomerism

MCQ

[Co(Br)(NH<sub>3</sub>)<sub>5</sub>]SO<sub>4</sub> represent

Assertion (A): Linkage isomerism arises in

coordination compounds because of ambidentate

ligand.

Reason (R): Ambidentate ligand like NO2 has two

different donor atoms i.e., N and O.

  1. Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).
  2. Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A).
  3. Assertion (A) is correct, but Reason (R) is incorrect statement.
  4. Assertion (A) is incorrect, but Reason (R) is correct statement. (2020)

VSA (1 mark)

  1. What type of isomerism is shown by the complex <math>[Co(NH3)5NO2]Cl2?</math> (2020)
  2. What type of isomerism is exhibited by the complex [Co(NH<sub>3</sub>)<sub>5</sub>Cl]SO<sub>4</sub>? (1/3, 2018)

What type of isomerism is exhibited by the following

complex : [Co(NH<sub>3</sub>)<sub>5</sub>SO<sub>4</sub>]CI (Foreign 2014)

  1. What type of isomerism is shown by the complex <math>[Co(NH3)6][Cr(CN)6]?</math> (1/3, Delhi 2017, Foreign 2014)
  2. What type of isomerism is shown by the complex <math>[Co(NH_2)_5(SCN)]^{2+}</math>? (1/3, Al 2017)
  3. What type of isomerism is exhibited by the complex [Co(NH<sub>2</sub>)<sub>5</sub>NO<sub>2</sub>]<sup>2+</sup>? (Foreign 2014)

Frequently asked questions

What is this document?

This is a Previous Year Question Paper (PYQ) for CBSE Class 12 Chemistry, specifically focusing on the topic of Coordination Compounds from the 2021-22 session.

What topics are covered in this paper?

The paper covers Werner's Theory, definitions of terms, nomenclature, and isomerism in coordination compounds, including concepts like coordination number and oxidation states.

How can solving this paper help students?

Solving this board question paper helps students understand the CBSE exam pattern, identify important concepts, and practice answering questions for better performance in their board exams.

What types of questions are included?

The paper features Multiple Choice Questions (MCQs), Very Short Answer (VSA), Short Answer (SA I), and Short Answer (SA II) questions.

Is this paper useful for revision?

Yes, this previous year's question paper is an excellent resource for revising the Coordination Compounds chapter and preparing effectively for the CBSE Class 12 Chemistry board examination.

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