Important Topics
- Ligands and coordination number
- IUPAC nomenclature
- Oxidation state and effective atomic number concepts
- Structural and stereoisomerism
- Crystal field splitting
- Magnetic behaviour and colour
Coordination compounds WBCHSE Class 12 MCQ & Practice Questions
Practice Coordination compounds MCQs for WBCHSE Class 12 Chemistry with answers, explanations, chapter revision and related ChemNexa mock tests.
Register Free for Full Chemistry PracticeCoordination compounds Revision Guide for WBCHSE Class 12 Chemistry
Coordination Compounds combines nomenclature, bonding, geometry, isomerism and magnetic behaviour. The chapter becomes much easier when oxidation state, coordination number and ligand type are identified before attempting the rest of a problem.
For WBCHSE Class 12 Chemistry, practise IUPAC naming, Werner concepts, isomerism, crystal field splitting, spin state and magnetic moment.
Important Formulae & Relationships
Magnetic moment μ = √(n(n+2)) BMOxidation state + ligand charges = charge on complex
Use formulas only after checking the required units, sign convention and assumptions for the question.
What to practise in Coordination compounds
Concept Revision
Revise definitions, principles, equations, trends and core ideas from Coordination compounds before attempting MCQs.
Exam-style MCQs
Use chapter-focused multiple-choice practice to improve accuracy, recall and application for WBCHSE Class 12 Chemistry.
Performance Practice
Attempt ChemNexa tests, review results and return to weak areas for another round of targeted revision.
Top 20 Coordination compounds MCQs with Answers
These public questions are selected from the exact Coordination compounds chapter, screened for topic relevance and deduplicated so repeated versions of the same MCQ are not shown publicly. Use them for quick revision, then sign in to attempt the complete test experience with more questions, results and performance review.
WBCHSE Class 12 Chemistry · Coordination compounds · Very Hard
1. Chelate effect কী?
Answer: A
Explanation: Ring formation ও entropy effects-এর জন্য chelating ligands analogous monodentate ligands-এর তুলনায় বেশি stable complex দেয়।
WBCHSE Class 12 Chemistry · Coordination compounds · Very Hard
2. [Co(NH3)6]Cl3-এ coordination number কত?
Answer: C
Explanation: Complex cation [Co(NH3)6]3+-এ ছয় monodentate NH3 ligand, তাই CN=6।
WBCHSE Class 12 Chemistry · Coordination compounds · Very Hard
3. Ethylenediamine (en) কী ধরনের ligand?
Answer: B
Explanation: en-এর দুটি N donor atom আছে; bidentate chelating ligand।
WBCHSE Class 12 Chemistry · Coordination compounds · Very Hard
4. [Co(en)3]3+ কী isomerism দেখাতে পারে?
Answer: A
Explanation: Three bidentate ligand octahedral arrangement Δ ও Λ enantiomers তৈরি করে।
WBCHSE Class 12 Chemistry · Coordination compounds · Very Hard
5. Werner theory-তে primary valency কিসের সমতুল্য?
Answer: A
Explanation: Primary valency ionizable ও oxidation state-এর সমতুল্য।
WBCHSE Class 12 Chemistry · Coordination compounds · Very Hard
6. Werner theory-তে secondary valency কিসের সমতুল্য?
Answer: B
Explanation: Secondary valency directional ও coordination number-এর সঙ্গে সম্পর্কিত।
WBCHSE Class 12 Chemistry · Coordination compounds · Very Hard
7. Strong-field ligand কোনটি?
Answer: C
Explanation: CN− spectrochemical series-এ strong-field ligand; বড় Δ সৃষ্টি করে।
WBCHSE Class 12 Chemistry · Coordination compounds · Very Hard
8. Octahedral crystal field-এ d orbitals কীভাবে split হয়?
Answer: A
Explanation: Octahedral ligands axes বরাবর আসায় dx2−y2,dz2 বেশি repulsion পায় (eg higher); t2g lower।
WBCHSE Class 12 Chemistry · Coordination compounds · Very Hard
9. Linkage isomerism কোন ligand-এর সঙ্গে দেখা যায়?
Answer: C
Explanation: Ambidentate NO2− N বা O atom দিয়ে bind করতে পারে, nitro/nitrito linkage isomers দেয়।
WBCHSE Class 12 Chemistry · Coordination compounds · Very Hard
10. Ionization isomerism-এ কী পরিবর্তিত হয়?
Answer: A
Explanation: Coordination sphere-এর ligand ও outer-sphere counter-ion exchange হলে ionization isomerism।
WBCHSE Class 12 Chemistry · Coordination compounds · Very Hard
11. [PtCl4]2−-এ Pt-এর oxidation state?
Answer: A
Explanation: x + 4(−1)=−2 ⇒ x=+2।
WBCHSE Class 12 Chemistry · Coordination compounds · Very Hard
12. [Fe(CN)6]4−-এ Fe-এর oxidation state?
Answer: A
Explanation: x + 6(−1)=−4 ⇒ x=+2।
WBCHSE Class 12 Chemistry · Coordination compounds · Very Hard
13. NH3 ligand-এর denticity কত?
Answer: A
Explanation: NH3 একটি donor N atom দিয়ে coordinate করে; monodentate।
WBCHSE Class 12 Chemistry · Coordination compounds · Very Hard
14. Coordination number 6-এর সাধারণ geometry?
Answer: C
Explanation: ছয়-coordinate complex-এর সবচেয়ে common geometry octahedral।
WBCHSE Class 12 Chemistry · Coordination compounds · Very Hard
15. Coordination number 4-এর d8 Pt(II) complex-এর সাধারণ geometry?
Answer: B
Explanation: Pt(II) d8 strong-field complexes সাধারণত square planar।
WBCHSE Class 12 Chemistry · Coordination compounds · Very Hard
16. [Pt(NH3)2Cl2] কোন isomerism দেখাতে পারে?
Answer: A
Explanation: Square-planar MA2B2 complex cis ও trans geometrical isomers দেয়।
WBCHSE Class 12 Chemistry · Coordination compounds · Very Hard
17. EAN rule-এ ligand electron pair donation কাকে গণনা করে?
Answer: A
Explanation: Ligand donor pairs metal centre-এর electron count বাড়ায়; total nearest noble gas configuration হলে EAN rule satisfied।
WBCHSE Class 12 Chemistry · Coordination compounds · Very Hard
18. Weak-field ligand কোনটি?
Answer: C
Explanation: F− weak field, সাধারণত high-spin complexes অনুকূল করে।
WBCHSE Class 12 Chemistry · Coordination compounds · Very Hard
19. Tetrahedral field-এ splitting octahedral-এর তুলনায় সাধারণত?
Answer: B
Explanation: Δt ≈ 4/9 Δo for comparable ligands; tetrahedral splitting smaller।
WBCHSE Class 12 Chemistry · Coordination compounds · Very Hard
20. The coordination number of Ni in
Answer: B
Explanation: Four carbonyl ligands bind through four carbon atoms.
Coordination compounds Practice Tests
Chapter 09 Coordination Compounds Set 01
Chapter-wise Practice · Very Hard
Chapter 09 Coordination Compounds Set 02
Chapter-wise Practice · Very Hard
Chapter 09 Coordination Compounds Set 03
Chapter-wise Practice · Very Hard
Chapter 09 Coordination Compounds Set 04
Chapter-wise Practice · Very Hard
Chapter 09 Coordination Compounds Set 05
Chapter-wise Practice · Very Hard
Chapter 09 Coordination Compounds Set 06
Chapter-wise Practice · Very Hard
Chapter 09 Coordination Compounds Set 07
Chapter-wise Practice · Very Hard
Chapter 09 Coordination Compounds Set 08
Chapter-wise Practice · Very Hard
Chapter 09 Coordination Compounds Set 09
Chapter-wise Practice · Very Hard
Chapter 09 Coordination Compounds Set 10
Chapter-wise Practice · Very Hard
Coordination compounds - SET 01
HOTS Questions · Very Hard
Coordination compounds Frequently Asked Questions
What should I identify first in a coordination complex?
Find the overall charge, ligand charges, oxidation state of the metal and coordination number. These determine many later steps.
How should I learn coordination nomenclature?
Apply the naming order consistently: ligands first, metal second, oxidation state in Roman numerals, and special metal endings for anionic complexes.
Why are unpaired electrons important?
The number of unpaired electrons determines magnetic behaviour and is closely related to crystal-field splitting and high-spin or low-spin configurations.
Related WBCHSE Class 12 Chemistry Chapters
Continue with another chapter to build connected concepts and strengthen your overall Chemistry preparation.
Continue WBCHSE Class 12 Chemistry
View all WBCHSE Class 12 chapters and testsBrowse all Chemistry PracticeCreate a free account