Coordination Compounds – MCQs (NEET Style)
Q1. A coordination compound consists of:
A. A central metal ion and ligands
B. Only non-metals
C. Only ions
D. Only organic molecules
Q2. The coordination number of [Fe(CN)₆]³⁻ is:
A. 2
B. 4
C. 6
D. 3
Q3. A ligand that can donate only one pair of electrons is called:
A. Bidentate
B. Monodentate
C. Polydentate
D. Chelating
Q4. Which of the following is a chelating ligand?
A. NH₃
B. H₂O
C. EDTA⁴⁻
D. Cl⁻
Q5. In the complex [Co(NH₃)₆]³⁺, the oxidation state of Co is:
A. +2
B. +3
C. +1
D. 0
Q6. Which of the following is a neutral ligand?
A. CN⁻
B. NH₃
C. Cl⁻
D. OH⁻
Q7. The IUPAC name of [CoCl₂(en)₂]Cl is:
A. Dichlorobis(ethylenediamine)cobalt(III) chloride
B. Bis(ethylenediamine)dichlorocobalt(III) chloride
C. Cobalt(III) dichlorobis(ethylenediamine) chloride
D. None of these
Q8. In [Cr(H₂O)₄Cl₂]⁺, the complex exhibits:
A. Ionization isomerism
B. Linkage isomerism
C. Coordination isomerism
D. None
Q9. [Co(NH₃)₅NO₂]²⁺ and [Co(NH₃)₅ONO]²⁺ are examples of:
A. Ionization isomers
B. Linkage isomers
C. Coordination isomers
D. Solvate isomers
Q10. [Pt(NH₃)₂Cl₂] shows which type of geometrical isomerism?
A. Cis-trans
B. Optical
C. Linkage
D. None
Q11. [Co(en)₃]³⁺ exhibits:
A. Optical isomerism
B. Geometrical isomerism
C. Both A and B
D. None
Q12. Which of the following is paramagnetic?
A. [Ni(CO)₄]
B. [Fe(CN)₆]³⁻
C. [Cu(NH₃)₄]²⁺
D. [Zn(CN)₄]²⁻
Q13. Werner’s theory is based on:
A. Coordination number and primary/secondary valency
B. Hybridization
C. Crystal field splitting
D. None
Q14. Which of the following complexes is tetrahedral?
A. [Ni(CO)₄]
B. [Pt(NH₃)₄]²⁺
C. [Co(NH₃)₆]³⁺
D. [Cr(H₂O)₆]³⁺
Q15. Which of the following is low-spin?
A. [Fe(CN)₆]³⁻
B. [Fe(H₂O)₆]³⁺
C. [Mn(H₂O)₆]²⁺
D. [CoF₆]³⁻
Q16. The central metal in a complex can be:
A. Cation
B. Anion
C. Neutral atom
D. Any of these
Q17. The IUPAC name of [Cr(H₂O)₄Cl₂]Cl is:
A. Tetraaquadichlorochromium(III) chloride
B. Dichlorotetraamminchromium(III) chloride
C. Chromium(III) tetraaquadichloride
D. None
Q18. The complex [Co(NH₃)₄Cl₂]⁺ exhibits:
A. Cis-trans isomerism
B. Optical isomerism
C. Both A and B
D. None
Q19. Which of the following is an ambidentate ligand?
A. NH₃
B. CN⁻
C. NO₂⁻
D. H₂O
Q20. [Co(NH₃)₅NO₂]²⁺ shows:
A. Linkage isomerism
B. Geometrical isomerism
C. Optical isomerism
D. Ionization isomerism
Q21. The splitting of d-orbitals in an octahedral complex is due to:
A. Ligand field
B. Hybridization
C. Covalent bonding
D. Ionization
Q22. The CFSE (Crystal Field Stabilization Energy) is maximum for:
A. High-spin d⁵
B. Low-spin d⁶
C. Low-spin d⁸
D. High-spin d³
Q23. [Ni(CO)₄] is:
A. Paramagnetic
B. Diamagnetic
C. Colored
D. Oxidizing agent
Q24. Which complex is square planar?
A. [Ni(CO)₄]
B. [Pt(NH₃)₂Cl₂]
C. [Co(NH₃)₆]³⁺
D. [Fe(H₂O)₆]³⁺
Q25. Chelates are:
A. Less stable
B. More stable than monodentate complexes
C. Same as monodentate complexes
D. Unstable
Q26. Which of the following affects stability of a complex?
A. Charge on central metal
B. Nature of ligand
C. Chelate effect
D. All of the above
Q27. [Fe(CN)₆]⁴⁻ is:
A. High-spin
B. Low-spin
C. Paramagnetic
D. None
Q28. The color of [Cu(H₂O)₆]²⁺ is:
A. Blue
B. Green
C. Colorless
D. Red
Q29. EDTA forms:
A. Monodentate complexes
B. Polydentate complexes
C. Ionization complexes
D. None
Q30. The coordination number of [Cr(NH₃)₆]³⁺ is:
A. 2
B. 4
C. 6
D. 8
Q31. Which of the following is an example of coordination isomerism?
A. [Co(NH₃)₆][Cr(CN)₆] and [Cr(NH₃)₆][Co(CN)₆]
B. [Co(NH₃)₅Cl]Cl₂ and [Co(NH₃)₅Br]Cl₂
C. [Co(en)₃]³⁺ and [Co(en)₃]³⁺
D. [Pt(NH₃)₂Cl₂] cis and trans
Q32. [Co(NH₃)₅Cl]Cl₂ shows:
A. Ionization isomerism
B. Linkage isomerism
C. Geometrical isomerism
D. Optical isomerism
Q33. In a coordination compound, ligands are:
A. Electron pair donors
B. Electron pair acceptors
C. Only anions
D. Only cations
Q34. The complex [Pt(NH₃)₄]²⁺ is:
A. Square planar
B. Tetrahedral
C. Octahedral
D. Linear
Q35. Optical isomerism occurs in:
A. [Co(en)₃]³⁺
B. [Co(NH₃)₆]³⁺
C. [PtCl₄]²⁻
D. [Ni(CO)₄]
Q36. Which complex exhibits cis-trans isomerism?
A. [Pt(NH₃)₂Cl₂]
B. [Co(NH₃)₆]³⁺
C. [Ni(CO)₄]
D. [Fe(CN)₆]³⁻
Q37. The color of [Co(H₂O)₆]²⁺ is:
A. Pink
B. Blue
C. Green
D. Colorless
Q38. [Fe(CN)₆]³⁻ is:
A. Paramagnetic
B. Diamagnetic
C. Colored due to d-d transition
D. None
Q39. Which of the following is a monodentate ligand?
A. EDTA⁴⁻
B. NH₃
C. En
D. Ox²⁻
Q40. Linkage isomerism occurs due to:
A. Different ligands
B. Different donor atoms in same ligand
C. Different metal ions
D. Coordination number
Q41. [Cr(H₂O)₄Cl₂]⁺ exhibits:
A. Geometrical isomerism
B. Optical isomerism
C. Linkage isomerism
D. None
Q42. The complex [Co(NH₃)₆]³⁺ is:
A. Octahedral
B. Tetrahedral
C. Square planar
D. Linear
Q43. Which of the following is diamagnetic?
A. [Ni(CO)₄]
B. [Fe(H₂O)₆]²⁺
C. [Mn(H₂O)₆]²⁺
D. [Cu(H₂O)₄]²⁺
Q44. The oxidation state of Co in [Co(NH₃)₅Cl]²⁺ is:
A. +2
B. +3
C. +1
D. 0
Q45. The number of geometrical isomers possible for [Pt(NH₃)₂Cl₂] is:
A. 1
B. 2
C. 3
D. 4
Q46. [Co(en)₂Cl₂]⁺ can show:
A. Cis-trans isomerism
B. Optical isomerism
C. Both A and B
D. None
Q47. Chelation increases:
A. Solubility
B. Stability
C. Reactivity
D. None
Q48. The color of [Cu(NH₃)₄]²⁺ is:
A. Deep blue
B. Light blue
C. Colorless
D. Green
Q49. The complex [CoCl₂(en)₂]⁺ shows:
A. Cis-trans isomerism
B. Linkage isomerism
C. Optical isomerism
D. Ionization isomerism
Q50. Werner’s theory explains:
A. Number of ligands around metal
B. Geometrical arrangement
C. Oxidation state
D. All of the above
Q1. A – Coordination compounds consist of a central metal ion and surrounding ligands.
Q2. C – [Fe(CN)₆]³⁻ has six ligands → coordination number = 6.
Q3. B – Monodentate ligands donate only one lone pair of electrons.
Q4. C – EDTA⁴⁻ is a polydentate (chelating) ligand.
Q5. B – In [Co(NH₃)₆]³⁺, Co oxidation state = +3.
Q6. B – NH₃ is a neutral ligand.
Q7. A – Correct IUPAC name: Dichlorobis(ethylenediamine)cobalt(III) chloride.
Q8. A – Ionization isomerism occurs when counter ions change.
Q9. B – Linkage isomerism occurs due to different donor atoms in the same ligand.
Q10. A – [Pt(NH₃)₂Cl₂] cis-trans isomerism is geometrical.
Q11. A – [Co(en)₃]³⁺ exhibits optical isomerism.
Q12. B – [Fe(CN)₆]³⁻ is low-spin diamagnetic.
Q13. A – Werner’s theory explains coordination number and primary/secondary valency.
Q14. A – [Ni(CO)₄] is tetrahedral (sp³ hybridization).
Q15. A – [Fe(CN)₆]³⁻ is low-spin complex.
Q16. D – Central metal can be cation, anion, or neutral atom.
Q17. A – Tetraaquadichlorochromium(III) chloride is correct IUPAC name.
Q18. A – [Co(NH₃)₄Cl₂]⁺ exhibits cis-trans isomerism.
Q19. C – NO₂⁻ is ambidentate (N or O donor).
Q20. A – [Co(NH₃)₅NO₂]²⁺ shows linkage isomerism.
Q21. A – d-orbitals split due to ligand field in octahedral complexes.
Q22. B – Low-spin d⁶ complex has maximum CFSE.
Q23. B – [Ni(CO)₄] is diamagnetic (low-spin due to strong field ligand).
Q24. B – [Pt(NH₃)₂Cl₂] is square planar.
Q25. B – Chelates are more stable than monodentate complexes.
Q26. D – Stability depends on metal charge, ligand type, and chelation effect.
Q27. B – [Fe(CN)₆]⁴⁻ is low-spin complex.
Q28. A – [Cu(H₂O)₆]²⁺ is blue due to d-d transitions.
Q29. B – EDTA⁴⁻ is polydentate (chelating).
Q30. C – [Cr(NH₃)₆]³⁺ coordination number = 6.
Q31. A – [Co(NH₃)₆][Cr(CN)₆] and [Cr(NH₃)₆][Co(CN)₆] are coordination (ionization) isomers.
Q32. A – [Co(NH₃)₅Cl]Cl₂ exhibits ionization isomerism.
Q33. A – Ligands are electron pair donors (Lewis bases).
Q34. A – [Pt(NH₃)₄]²⁺ is square planar.
Q35. A – [Co(en)₃]³⁺ exhibits optical isomerism.
Q36. A – [Pt(NH₃)₂Cl₂] shows cis-trans (geometrical) isomerism.
Q37. A – [Co(H₂O)₆]²⁺ is pink.
Q38. A – [Fe(CN)₆]³⁻ is paramagnetic due to one unpaired electron.
Q39. B – NH₃ is monodentate.
Q40. B – Linkage isomerism occurs due to different donor atoms in same ligand.
Q41. A – [Cr(H₂O)₄Cl₂]⁺ shows geometrical isomerism (cis-trans).
Q42. A – [Co(NH₃)₆]³⁺ is octahedral.
Q43. A – [Ni(CO)₄] is diamagnetic.
Q44. B – Oxidation state of Co in [Co(NH₃)₅Cl]²⁺ = +3.
Q45. B – Two geometrical isomers: cis and trans.
Q46. C – [Co(en)₂Cl₂]⁺ shows both cis-trans and optical isomerism.
Q47. B – Chelation increases stability of complex.
Q48. A – [Cu(NH₃)₄]²⁺ is deep blue.
Q49. A – [CoCl₂(en)₂]⁺ shows cis-trans isomerism.
Q50. D – Werner’s theory explains coordination number, geometrical arrangement, and oxidation state.
Disclaimer:
All MCQs and solutions are educational, and for practice purposes only. They are based on NCERT and NEET syllabus and are not official NEET questions.