Coordination Compounds MCQs for NEET, 50 Most Important Coordination Compounds MCQs for NEET Chemistry CBT Test 2027:coordination-compounds-mcq-for-neet, Practice the most important Coordination Compounds MCQs for NEET 2026 Chemistry preparation. Includes 50 solved multiple choice questions with answers based on NCERT Class 12 Chemistry. Perfect for CBT test practice, SBT exams, quick revision, mock tests, and competitive exam preparation.coordination-compounds-mcq-for-neet
50 Most Important Coordination Compounds MCQs for NEET Chemistry CBT Test 2027
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Q1. Which Swiss chemist was the first to formulate ideas regarding the structures of coordination compounds and received the Nobel Prize in 1913? (A) Alfred Werner (B) Linus Pauling (C) Hans Bethe (D) J.H. van’t Hoff
Answer: (A) Alfred Werner Explanation: Alfred Werner proposed the coordination theory in 1893, explaining the structure and bonding in coordination compounds. He was awarded the Nobel Prize in Chemistry in 1913 for this pioneering work.50 Most Important Coordination Compounds MCQs for NEET Chemistry CBT Test 2027
Q2. According to Werner’s theory, what type of valence is ionisable and corresponds to the oxidation state of the metal? (A) Secondary valence (B) Primary valence (C) Tertiary valence (D) Non-ionisable valence
Answer: (B) Primary valence Explanation: In Werner’s theory, primary valence is ionisable and equals the oxidation state of the central metal ion. It is satisfied by negative ions and can be precipitated.
Q3. In Werner’s theory, the secondary valence is equal to which of the following? (A) Oxidation number (B) Atomic number (C) Coordination number (D) Valency
Answer: (C) Coordination number Explanation: Secondary valence is non-ionisable and corresponds to the coordination number of the central metal, i.e., the number of ligands directly attached to it.
Q4. How many moles of AgCl are precipitated when 1 mole of CoCl₃⋅6NH₃ (yellow) reacts with excess silver nitrate? (A) 1 mole (B) 2 moles (C) 3 moles (D) 0 moles
Answer: (C) 3 moles Explanation: The complex is [Co(NH₃)₆]Cl₃. All three chloride ions are outside the coordination sphere (ionisable) and react with AgNO₃ to give 3 moles of AgCl.
Q5. Which geometrical shapes are postulated by Werner to be most common for transition metal coordination compounds? (A) Pentagonal (B) Octahedral, tetrahedral, and square planar (C) Linear (D) Trigonal bipyramidal
Answer: (B) Octahedral, tetrahedral, and square planar Explanation: Werner proposed these three geometries as the most common for coordination numbers 6, 4, and 4 respectively.50 Most Important Coordination Compounds MCQs for NEET Chemistry CBT Test 2027
Q6. What is the central atom or ion in a coordination entity also referred to as? (A) Lewis base (B) Lewis acid (C) Brønsted acid (D) Brønsted base
Answer: (B) Lewis acid Explanation: The central metal ion accepts electron pairs from ligands and thus acts as a Lewis acid.Coordination Compounds MCQs for NEET
Q7. A ligand that is bound to a metal ion through a single donor atom is called what? (A) Didentate (B) Polydentate (C) Unidentate (D) Ambidentate
Answer: (C) Unidentate Explanation: Unidentate (or monodentate) ligands have only one donor atom that donates a pair of electrons to the metal.
Q8. Which of the following is an example of a didentate ligand? (A) Cl⁻ (B) H₂O (C) Ethane-1,2-diamine (D) NH₃
Answer: (C) Ethane-1,2-diamine Explanation: Ethane-1,2-diamine (en) has two nitrogen atoms that can coordinate, making it a bidentate (didentate) ligand.
Q9. What is the denticity of the ethylenediaminetetraacetate ion (EDTA⁴⁻)? (A) Two (B) Four (C) Six (D) Eight
Answer: (C) Six Explanation: EDTA⁴⁻ is a hexadentate ligand; it binds through two nitrogen atoms and four oxygen atoms.Coordination Compounds MCQs for NEET
Q10. What term describes a ligand that can bind through two different donor atoms, such as NO₂⁻? (A) Chelate ligand (B) Unidentate ligand (C) Ambidentate ligand (D) Polydentate ligand
Answer: (C) Ambidentate ligand Explanation: Ambidentate ligands have two different donor atoms and can coordinate through either one (e.g., NO₂⁻ can bind via N or O).
Q11. The coordination number of the central atom is determined only by the number of which type of bonds? (A) Pi bonds (B) Sigma bonds (C) Ionic bonds (D) Hydrogen bonds
Answer: (B) Sigma bonds Explanation: Coordination number is the number of sigma bonds formed by the ligands with the central metal atom.50 Most Important Coordination Compounds MCQs for NEET Chemistry CBT Test 2027
Q12. The central atom and the ligands attached to it are enclosed in square brackets and collectively termed as what? (A) Counter ions (B) Coordination sphere (C) Coordination polyhedron (D) Complex ion
Answer: (B) Coordination sphere Explanation: The coordination sphere includes the central metal and the ligands directly attached to it; it is written inside square brackets.
Q13. What is the spatial arrangement of ligand atoms directly attached to the central atom called? (A) Coordination sphere (B) Coordination polyhedron (C) Oxidation state (D) Denticity
Answer: (B) Coordination polyhedron Explanation: It represents the geometric shape formed by the positions of the ligands around the central atom (e.g., octahedron, tetrahedron).
Q14. In which type of complex is a metal bound to only one kind of donor group? (A) Heteroleptic (B) Homoleptic (C) Isomeric (D) Polyhedral
Answer: (B) Homoleptic Explanation: Homoleptic complexes contain only one type of ligand (e.g., [Ni(CO)₄], [Co(NH₃)₆]³⁺).Coordination Compounds MCQs for NEET
Q15. According to IUPAC norms, how are ligands listed when writing the formula of a coordination entity? (A) Alphabetical order (B) Increasing charge (C) Decreasing size (D) Based on metal type
Answer: (A) Alphabetical order Explanation: Ligands are written in alphabetical order based on the first letter of their name (ignoring prefixes like di-, tri-).
Q16. When naming a coordination compound, which part is always named first? (A) Anion (B) Ligand (C) Cation (D) Central metal
Answer: (C) Cation Explanation: The cation is named first, followed by the anion (e.g., in [Co(NH₃)₆]Cl₃, hexaamminecobalt(III) chloride).
Q17. What suffix is added to the name of the central metal if the complex ion is an anion? (A) –ide (B) –ate (C) –ite (D) –ous
Answer: (B) –ate Explanation: For anionic complexes, the metal name ends with “-ate” (e.g., ferrate, cuprate).50 Most Important Coordination Compounds MCQs for NEET Chemistry CBT Test 2027
Q18. What is the IUPAC name for [Ni(CO)₄]? (A) Tetracarbonylnickel(II) (B) Tetracarbonylnickel(0) (C) Tetracarbonylnickelate(0) (D) Nickel tetracarbonyl
Answer: (B) Tetracarbonylnickel(0) Explanation: It is a neutral complex; the oxidation state of Ni is 0, so it is named tetracarbonylnickel(0).
Q19. Compounds with the same chemical formula but different arrangements of atoms are called what? (A) Isotopes (B) Isomers (C) Allotropes (D) Polymers
Answer: (B) Isomers Explanation: Isomers have the same molecular formula but different spatial or structural arrangements.50 Most Important Coordination Compounds MCQs for NEET Chemistry CBT Test 2027
Q20. Which type of isomerism arises in heteroleptic complexes due to different possible geometric arrangements of ligands? (A) Optical isomerism (B) Geometrical isomerism (C) Linkage isomerism (D) Solvate isomerism
Answer: (B) Geometrical isomerism Explanation: It occurs in square planar and octahedral complexes (cis-trans isomerism) due to different ligand arrangements.50 Most Important Coordination Compounds MCQs for NEET Chemistry CBT Test 2027
Q21. Why is geometrical isomerism not possible in tetrahedral complexes with four different ligands? (A) They are too small (B) Relative positions are the same (C) They are always chiral (D) Ligands are too far
Answer: (B) Relative positions are the same Explanation: In tetrahedral geometry, all bond angles are 109.5°, so all positions are equivalent; no cis-trans isomers exist.
Q22. What are mirror images that cannot be superimposed on one another called? (A) Isotopes (B) Enantiomers (C) Geometrical isomers (D) Coordination isomers
Answer: (B) Enantiomers Explanation: Enantiomers are non-superimposable mirror images and show optical isomerism.50 Most Important Coordination Compounds MCQs for NEET Chemistry CBT Test 2027
Q23. Which isomerism occurs when a ligand can coordinate through two different atoms, like SCN⁻? (A) Coordination isomerism (B) Ionisation isomerism (C) Linkage isomerism (D) Solvate isomerism
Answer: (C) Linkage isomerism Explanation: Linkage isomers differ in the atom of the ligand through which it is attached to the metal.
Q24. What type of isomerism involves the interchange of ligands between cationic and anionic entities? (A) Linkage (B) Coordination (C) Ionisation (D) Hydrate
Answer: (B) Coordination Explanation: Coordination isomerism occurs when ligands are exchanged between the coordination spheres of cationic and anionic complexes.50 Most Important Coordination Compounds MCQs for NEET Chemistry CBT Test 2027
Q25. Which form of isomerism is also known as “hydrate isomerism” when water is the solvent? (A) Linkage (B) Ionisation (C) Solvate (D) Geometrical
Answer: (C) Solvate Explanation: Solvate isomerism arises due to different numbers of solvent molecules inside and outside the coordination sphere (hydrate isomerism when solvent is water).
Q26. Which theory uses (n-1)d, ns, and np orbitals for hybridisation to explain bonding? (A) Crystal Field Theory (B) Valence Bond Theory (C) Molecular Orbital Theory (D) Ligand Field Theory
Answer: (B) Valence Bond Theory Explanation: Valence Bond Theory (VBT) explains bonding through hybridisation of (n-1)d, ns, and np orbitals.
Q27. What is the hybridisation and shape for a coordination number of 4 that is diamagnetic like [Ni(CN)₄]²⁻? (A) sp³, Tetrahedral (B) dsp², Square planar (C) sp³d², Octahedral (D) d²sp³, Octahedral
Answer: (B) dsp², Square planar Explanation: [Ni(CN)₄]²⁻ is square planar and diamagnetic due to dsp² hybridisation and pairing of electrons.50 Most Important Coordination Compounds MCQs for NEET Chemistry CBT Test 2027
Q28. An octahedral complex using inner d orbitals (d²sp³ hybridisation) is called what? (A) High spin complex (B) Low spin complex (C) Spin free complex (D) Outer orbital complex
Answer: (B) Low spin complex Explanation: Inner orbital complexes (d²sp³) use inner d orbitals and generally form low spin complexes.50 Most Important Coordination Compounds MCQs for NEET Chemistry CBT Test 2027
Q29. What type of hybridisation is found in [CoF₆]³⁻, which is a paramagnetic high spin complex? (A) d²sp³ (B) sp³d² (C) dsp² (D) sp³
Answer: (B) sp³d² Explanation: [CoF₆]³⁻ is an outer orbital complex with sp³d² hybridisation and high spin due to weak field ligand F⁻.50 Most Important Coordination Compounds MCQs for NEET Chemistry CBT Test 2027
Q30. Which theory considers the metal-ligand bond to be purely ionic arising from electrostatic interactions? (A) Valence Bond Theory (B) Crystal Field Theory (C) Werner’s Theory (D) Molecular Orbital Theory
Answer: (B) Crystal Field Theory Explanation: Crystal Field Theory (CFT) treats the metal-ligand bond as purely ionic and explains splitting of d-orbitals due to electrostatic repulsion.
Q31. In an octahedral field, which d orbitals point towards the axes and experience more repulsion? (A) dxy, dyz, dxz (B) dx²−y², dz² (C) All five orbitals (D) None of them
Answer: (B) dx²−y², dz² Explanation: These orbitals (eg set) point directly towards the ligands along the axes and experience greater repulsion.
Q32. What is the lower energy set of three orbitals in an octahedral crystal field splitting called? (A) eg set (B) t₂g set (C) d set (D) f set
Answer: (B) t₂g set Explanation: The t₂g set (dxy, dyz, dxz) has lower energy as these orbitals point between the axes.50 Most Important Coordination Compounds MCQs for NEET Chemistry CBT Test 2027
Q33. What is the series that arranges ligands in order of increasing field strength? (A) Electrochemical series (B) Spectrochemical series (C) Reactivity series (D) Homologous series
Answer: (B) Spectrochemical series Explanation: The spectrochemical series orders ligands from weak field to strong field (I⁻ < Br⁻ < Cl⁻ < F⁻ < … < CN⁻).50 Most Important Coordination Compounds MCQs for NEET Chemistry CBT Test 2027
Q34. If the crystal field splitting (Δ₀) is less than the pairing energy (P), what is the result? (A) Low spin complex (B) High spin complex (C) Diamagnetic complex (D) Inner orbital complex
Answer: (B) High spin complex Explanation: When Δ₀ < P, electrons prefer to occupy higher orbitals singly rather than pairing up, resulting in high spin.Coordination Compounds MCQs for NEET
Q35. How does the tetrahedral crystal field splitting (Δt) compare to the octahedral splitting (Δ₀)? (A) Δt = Δ₀ (B) Δt = (4/9)Δ₀ (C) Δt = 2Δ₀ (D) Δt = (9/4)Δ₀
Answer: (B) Δt = (4/9)Δ₀ Explanation: Tetrahedral splitting is smaller because ligands approach between the axes, and it is 4/9th of octahedral splitting.
Q36. Why are transition metal complexes often coloured? (A) Electronic transitions within d orbitals (B) High density (C) Large atomic mass (D) Presence of pi bonds
Answer: (A) Electronic transitions within d orbitals Explanation: Colour arises due to d-d transitions when electrons absorb visible light and jump from t₂g to eg orbitals.
Q37. Which gemstone’s red colour is due to Cr³⁺ ions in an Al₂O₃ lattice? (A) Emerald (B) Ruby (C) Sapphire (D) Diamond
Answer: (B) Ruby Explanation: In ruby, Cr³⁺ ions replace some Al³⁺ ions in Al₂O₃, causing red colour due to d-d transitions.
Q38. What is the green pigment in plants that is a coordination compound of magnesium? (A) Haemoglobin (B) Vitamin B₁₂ (C) Chlorophyll (D) Carboxypeptidase
Answer: (C) Chlorophyll Explanation: Chlorophyll contains Mg²⁺ at the centre of a porphyrin ring and is responsible for the green colour of plants.
Q39. Haemoglobin is a coordination compound of which metal? (A) Magnesium (B) Iron (C) Cobalt (D) Copper
Answer: (B) Iron Explanation: Haemoglobin contains Fe²⁺ coordinated in a porphyrin ring and transports oxygen.50 Most Important Coordination Compounds MCQs for NEET Chemistry CBT Test 2027
Q40. Vitamin B₁₂ (cyanocobalamin) contains which metal ion? (A) Iron (B) Zinc (C) Cobalt (D) Nickel
Answer: (C) Cobalt Explanation: Vitamin B₁₂ has a cobalt ion at the centre of a corrin ring.
Q41. Which catalyst is used for the hydrogenation of alkenes? (A) Ziegler-Natta (B) Wilkinson catalyst (C) Haber catalyst (D) Contact catalyst
Answer: (B) Wilkinson catalyst Explanation: Wilkinson’s catalyst ([RhCl(PPh₃)₃]) is a well-known homogeneous catalyst for hydrogenation of alkenes.
Q42. Which ligand is used in chelate therapy for the treatment of lead poisoning? (A) NH₃ (B) EDTA (C) CN⁻ (D) Cl⁻
Answer: (B) EDTA Explanation: EDTA forms a stable complex with Pb²⁺ and helps in its excretion from the body.50 Most Important Coordination Compounds MCQs for NEET Chemistry CBT Test 2027
Q43. What term describes the bonding in metal carbonyls where metal to ligand π bonding strengthens the CO-metal bond? (A) Ionic effect (B) Synergic effect (C) Chelate effect (D) Inductive effect
Answer: (B) Synergic effect Explanation: Synergic bonding involves σ-donation from CO to metal and π-back donation from metal to CO, strengthening the bond.
Q44. In [Ni(CO)₄], what is the oxidation state of nickel? (A) +2 (B) +4 (C) 0 (D) -1
Answer: (C) 0 Explanation: CO is a neutral ligand, so the oxidation state of Ni in [Ni(CO)₄] is zero.
Q45. Which complex is used as an effective inhibitor of tumour growth in medicinal chemistry? (A) cis-platin (B) trans-platin (C) Wilkinson catalyst (D) EDTA
Answer: (A) cis-platin Explanation: Cisplatin (cis-[Pt(NH₃)₂Cl₂]) is a well-known anticancer drug that binds to DNA.
Q46. Hardness of water can be estimated by titration with which reagent? (A) NaCl (B) Na₂EDTA (C) NaOH (D) Na₂CO₃
Answer: (B) Na₂EDTA Explanation: EDTA forms stable complexes with Ca²⁺ and Mg²⁺ and is used in complexometric titration for water hardness.
Q47. The extraction of which metal involves the formation of the complex [Au(CN)₂]⁻? (A) Silver (B) Gold (C) Copper (D) Iron
Answer: (B) Gold Explanation: In cyanide process, gold dissolves to form soluble [Au(CN)₂]⁻ complex.50 Most Important Coordination Compounds MCQs for NEET Chemistry CBT Test 2027
Q48. Complexes in which the metal is bound to more than one kind of donor group are called? (A) Homoleptic (B) Heteroleptic (C) Monoleptic (D) Isomeric
Answer: (B) Heteroleptic Explanation: Heteroleptic complexes contain more than one type of ligand (e.g., [Co(NH₃)₄Cl₂]⁺).
Q49. What is the coordination number of Fe in [Fe(C₂O₄)₃]³⁻? (A) Three (B) Four (C) Six (D) Two
Answer: (C) Six Explanation: Each oxalate (C₂O₄²⁻) is bidentate; three oxalates provide 6 coordination sites.50 Most Important Coordination Compounds MCQs for NEET Chemistry CBT Test 2027
Q50. The violet colour of [Ti(H₂O)₆]³⁺ is explained by which phenomenon? (A) s-p transition (B) d-d transition (C) Charge transfer (D) Ligand splitting
Answer: (B) d-d transition Explanation: Ti³⁺ has one d-electron; absorption of light causes d-d transition, resulting in violet colour.50 Most Important Coordination Compounds MCQs for NEET Chemistry CBT Test 2027