CBSE Class 12 Chemistry Coordination Chemistry Assignment

Read and download the CBSE Class 12 Chemistry Coordination Chemistry Assignment for the 2025-26 academic session. We have provided comprehensive Class 12 Chemistry school assignments that have important solved questions and answers for Unit 5 Coordination Compounds. These resources have been carefuly prepared by expert teachers as per the latest NCERT, CBSE, and KVS syllabus guidelines.

Solved Assignment for Class 12 Chemistry Unit 5 Coordination Compounds

Practicing these Class 12 Chemistry problems daily is must to improve your conceptual understanding and score better marks in school examinations. These printable assignments are a perfect assessment tool for Unit 5 Coordination Compounds, covering both basic and advanced level questions to help you get more marks in exams.

Unit 5 Coordination Compounds Class 12 Solved Questions and Answers

 

 
LEVEL-1 QUESTIONS
 
1.Define Ligand . Give one example also.
The ion or molecules which are coordinately bonded to central metalatom in the coordination entity are called ligands.
 
2. Why Coordination compounds are coloured?
Due to d-d transition.
 
3. What is Homoleptic complexes?
The complexes in which a metal is bound to only one kind of donorgroups. E.g., [Co(NH3)6]3+
 
4. What is the Oxidation no. of cobalt in K[Co(CO)4]?
+1
 
5. Explain each of the following: coordination entity, ligand, coordination number, coordination polyhedron, homoleptic and heteroleptic.
Answer
(i)Coordination entity:
A coordination entity is an electrically charged radical or species carrying a positive ornegative charge. In a coordination entity, the central atom or ion is surrounded by a suitablenumber of
neutral molecules or negative ions ( called ligands)
 
(ii)Ligands
The neutral molecules or negatively charged ions that surround the metal atom in acoordination entity or a coordinal complex are known as ligands. For example,,Cl−, −OH. Ligands are usually polar in nature and possess at least one unshared pair ofvalence electrons.
 
(iii)Coordination number:
The total number of ligands (either neutral molecules or negative ions) that get attached tothe central metal atom in the coordination sphere is called the coordination number of thecentral metal atom. It is also referred to as its ligancy.
 
(vi)Coordination polyhedron:
Coordination polyhedrons about the central atom can be defined as the spatial arrangement of the ligands that are directly attached to the central metal ion in the coordination sphere.
 
(v)Homoleptic complexes:
These are those complexes in which the metal ion is bound to only one kind of a donorgroup.
 
(vi)Heteroleptic complexes:
Heteroleptic complexes are those complexes where the central metal ion is bound to morethan one
type of a donor group.
 
6. What is meant by unidentate, didentate and ambidentate ligands? Give two examples for each.
Answer A ligand may contain one or more unshared pairs of electrons which are called the donorsites of ligands. Now, depending on the number of these donor sites, ligands can be classifiedas follows:
 
(a)Unidentate ligands: Ligands with only one donor sites are called unidentate ligands. Fore.g., ,Cl− etc.
 
(b)Didentate ligands: Ligands that have two donor sites are called didentate ligands. Fore.g.,

(a) Ethane-1,2-diamine

(b) Oxalate ion

(c)Ambidentate ligands:
Ligands that can attach themselves to the central metal atom through two different atoms arecalled ambidentate ligands.

7.Write the name of each of the following complex compound
(a) [Co(NH3)4(H2O)2]Cl3
(b) [Pt(NH3)4][NiCl4]
Ans. (a) Tetraamminediaquacobalt(III)chloride
(b) Tetraammineplatinum(II)tetrachloridonickelate(II)

Write the IUPAC name of [CrCl2(en)(NH3)2]+
Ans. Diamminedichloridoethane-1,2-diamminechromium(III)ion

Why only transition metals are known to form π complexes?
Ans. Transition metals have empty d-orbitals into which the electron-pairs can be donated by ligands containing π electrons, i.e, electrons in their π molecular orbital.

10. CO is a stronger ligand than NH3. Why?
Ans. Back bonding.

11. What is crystal field splitting energy?
Energy difference between eg and t2g level.

12. Differentiate between:

a) Didentate and Polydentate ligand

Didentate ligand : Two binding sites

Polydentate ligand: more than two binding sites

b) Chelate ligand and ambidentate ligand

Chelate ligand : Forms cyclic structure.

ambidentate ligand : Bind through either of the atoms.
 
 
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CBSE Class 12 Chemistry Unit 5 Coordination Compounds Assignment

Access the latest Unit 5 Coordination Compounds assignments designed as per the current CBSE syllabus for Class 12. We have included all question types, including MCQs, short answer questions, and long-form problems relating to Unit 5 Coordination Compounds. You can easily download these assignments in PDF format for free. Our expert teachers have carefully looked at previous year exam patterns and have made sure that these questions help you prepare properly for your upcoming school tests.

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  • Better Exam Scores: Regular practice will help you to understand Unit 5 Coordination Compounds properly and  you will be able to answer exam questions correctly.
  • Latest Exam Pattern: All questions are aligned as per the latest CBSE sample papers and marking schemes.
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  • Time Management: Solving these Unit 5 Coordination Compounds test papers daily will improve your speed and accuracy.

How to solve Chemistry Unit 5 Coordination Compounds Assignments effectively?

  1. Read the Chapter First: Start with the NCERT book for Class 12 Chemistry before attempting the assignment.
  2. Self-Assessment: Try solving the Unit 5 Coordination Compounds questions by yourself and then check the solutions provided by us.
  3. Use Supporting Material: Refer to our Revision Notes and Class 12 worksheets if you get stuck on any topic.
  4. Track Mistakes: Maintain a notebook for tricky concepts and revise them using our online MCQ tests.

Best Practices for Class 12 Chemistry Preparation

For the best results, solve one assignment for Unit 5 Coordination Compounds on daily basis. Using a timer while practicing will further improve your problem-solving skills and prepare you for the actual CBSE exam.

Where can I download the latest CBSE Class 12 Chemistry Chapter Unit 5 Coordination Compounds assignments?

You can download free PDF assignments for Class 12 Chemistry Chapter Unit 5 Coordination Compounds from StudiesToday.com. These practice sheets have been updated for the 2025-26 session covering all concepts from latest NCERT textbook.

Do these Chemistry Chapter Unit 5 Coordination Compounds assignments include solved questions?

Yes, our teachers have given solutions for all questions in the Class 12 Chemistry Chapter Unit 5 Coordination Compounds assignments. This will help you to understand step-by-step methodology to get full marks in school tests and exams.

Are the assignments for Class 12 Chemistry Chapter Unit 5 Coordination Compounds based on the 2026 exam pattern?

Yes. These assignments are designed as per the latest CBSE syllabus for 2026. We have included huge variety of question formats such as MCQs, Case-study based questions and important diagram-based problems found in Chapter Unit 5 Coordination Compounds.

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