This quiz works best with JavaScript enabled. Home > Cbse > Class 12 > Science > Chemistry Part Ii > Class 12 Chemistry (Part Ii) Chapter 9 Coordination Compounds – Quiz 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part Ii) Chapter 9 Coordination Compounds Quiz 1 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What does the primary valency of a coordination compound represent? A) The number of ligands attached to the central metal atom. B) The oxidation state of the central metal atom. C) The total number of coordination sites available. D) The geometric arrangement of ligands around the metal. Show Answer Correct Answer: B) The oxidation state of the central metal atom. 2. The shape of a coordination compound is determined by its: A) Coordination number. B) Ligand charge. C) Metal identity. D) Solvent. Show Answer Correct Answer: A) Coordination number. 3. [Co(NH3)(H2O)5]Cl3 is an example of ..... isomerism. A) Ionisation. B) Coordination. C) Hydrate. D) Linkage. Show Answer Correct Answer: C) Hydrate. 4. [FeF6]3-Has ..... Hybridization A) Dsp2. B) Sp3. C) D2sp3. D) Sp3d2. Show Answer Correct Answer: D) Sp3d2. 5. What is the formula for the pentaamminehydroxoiron(II) ion? A) [Fe(NH$_{3}$)$_{5}$(OH)$_{5}$]$^{3-}$. B) [Fe(NH$_{3}$)(OH)$_{5}$]$^{3-}$. C) [Fe(NH$_{3}$)$_{5}$(OH)$_{5}$]$^{2+}$. D) [Fe(NH$_{3}$)$_{5}$(OH)]$^{+}$. E) [Fe(NH$_{3}$)$_{5}$(OH)]$^{2+}$. Show Answer Correct Answer: D) [Fe(NH$_{3}$)$_{5}$(OH)]$^{+}$. 6. Which complex obeys EAN rule? A) CuSO4. B) FeSO4. C) ZnCl2. D) Ni(CO)4. Show Answer Correct Answer: D) Ni(CO)4. 7. Which of the following is an example of a coordination compound used in medicine? A) NaCl. B) EDTA. C) C6H12O6. D) H2O. Show Answer Correct Answer: B) EDTA. 8. Which of the following is the correct IUPAC name for [Co(NH3)6]Cl3? A) Hexaammineplatinum(IV) chloride. B) Hexaamminecobalt(III) chloride. C) Hexaamminechromium(III) chloride. D) Hexaammineiron(III) chloride. Show Answer Correct Answer: B) Hexaamminecobalt(III) chloride. 9. Which orbital is very important in CFT? A) Orbital p. B) Orbital s. C) Orbital d. D) None of the above. Show Answer Correct Answer: C) Orbital d. 10. What are coordination compounds primarily formed from? A) Metal atoms and ligands. B) Covalent bonds. C) Ionic bonds. D) Hydrogen bonds. Show Answer Correct Answer: A) Metal atoms and ligands. 11. What is the role of ligands in coordination compounds? A) To decrease the solubility of the compound. B) To provide electrons to the metal. C) To increase the temperature of the solution. D) To change the color of the solution. Show Answer Correct Answer: B) To provide electrons to the metal. 12. The negative ligand is A) Aqua. B) Nitrosonium. C) Sulphato. D) Carboxyl. Show Answer Correct Answer: C) Sulphato. 13. What is the importance of stereoisomerism in coordination compounds? A) Affects color. B) Changes coordination number. C) Influences biological activity. D) Determines solubility. Show Answer Correct Answer: C) Influences biological activity. 14. Ethylenediamine (en) is a bidentate ligand. What is the coordination number of cobalt in [Co(en)$_{2}$Cl$_{2}$]Cl? A) 6. B) 5. C) 7. D) 4. E) 8. Show Answer Correct Answer: A) 6. 15. Hemoglobin contains a heme ligand. How many nitrogen atoms in the heme interact with the central iron atom? A) Three. B) Four. C) One. D) Two. Show Answer Correct Answer: B) Four. 16. What is the name of the phenomenon where a compound has two or more structural isomers? A) Oxidation state. B) Coordination number. C) Isomerism. D) Chelation. Show Answer Correct Answer: C) Isomerism. 17. The charge of the oxalate ion is ..... A) 3+. B) 1-. C) 2-. D) 2+. Show Answer Correct Answer: C) 2-. 18. State the charge of the bromide ligand A) -2. B) +1. C) -1. D) +2. Show Answer Correct Answer: C) -1. 19. In biological coordination chemistry, which metal ion is centrally coordinated in the heme prosthetic group of hemoglobin that enables reversible oxygen binding? A) Zn (zinc). B) Fe (iron). C) Cu (copper). D) Co (cobalt). Show Answer Correct Answer: B) Fe (iron). 20. What is the correct IUPAC name for [Fe(CN)6]3-? A) Dicyanoferrate(II). B) Hexacyanoferrate(III). C) Pentacyanoferrate(III). D) Hexacyanoferrate(II). Show Answer Correct Answer: B) Hexacyanoferrate(III). 21. What is the IUPAC name for [Pt(NH3)2Cl(NO2)]? A) Potassium trioxalatochromate(III). B) Dichloridobis(ethane-1, 2-diamine)cobalt(III) chloride. C) Diamminechloridonitrito-N-platinum(II). D) Pentaamminecarbonatocobalt(III) chloride. Show Answer Correct Answer: C) Diamminechloridonitrito-N-platinum(II). 22. What is the electron configuration of the Ni(II) ion? A) [Ar] 4s$^{2}$3d$^{6}$. B) [Ar] 4s$^{1}$3d$^{7}$. C) [Ar] 4s$^{2}$3d$^{8}$. D) [Ar] 3d$^{8}$. E) None of these. Show Answer Correct Answer: D) [Ar] 3d$^{8}$. 23. What is the electron configuration of the Mn(II) ion? A) [Ar] 4s$^{2}$3d$^{5}$. B) [Ar] 3d$^{5}$. C) Ar] 4s$^{1}$3d$^{5}$. D) [Ar] 4s$^{2}$3d$^{3}$. E) None of these. Show Answer Correct Answer: B) [Ar] 3d$^{5}$. 24. What is the coordination number of a metal atom in a tetrahedral complex? A) 6. B) 7. C) 4. D) 5. Show Answer Correct Answer: C) 4. 25. Which of the following does not obey EAN rule? A) [Fe(CN)6]-3. B) Ni(CO)4. C) [Pt(NH3)3Cl3]+. D) [Cu(CN)4]-3. Show Answer Correct Answer: A) [Fe(CN)6]-3. 26. Which of the following statements about ligands is true? A) Only anionic ligands can coordinate. B) Ligands can be neutral or charged. C) All ligands are bidentate. D) Ligands do not affect the geometry of the complex. Show Answer Correct Answer: B) Ligands can be neutral or charged. 27. A complex with the composition [MA2B2]X2 is found to have no geometrical isomers. Both A and B are monodentate ligands. The structure of the complex is A) Linear. B) Octahedral. C) Square planar. D) Tetrahedral. Show Answer Correct Answer: D) Tetrahedral. 28. How do you determine the overall charge of a coordination complex? A) The overall charge is determined by the number of ligands only. B) The overall charge is the sum of the atomic numbers of the metal and ligands. C) The overall charge is the sum of the oxidation state of the metal and the charges of the ligands. D) The overall charge is always zero regardless of the ligands. Show Answer Correct Answer: C) The overall charge is the sum of the oxidation state of the metal and the charges of the ligands. 29. The unpaired electrons in Ni(CO)4 are A) 3. B) 0. C) 1. D) 4. Show Answer Correct Answer: B) 0. 30. The complexes with coordination number 4 A) Only Square planer geometry. B) Only Tetrahedral geometry. C) Either Tetrahedral or square planar geometry. D) Octahedral geometry. Show Answer Correct Answer: C) Either Tetrahedral or square planar geometry. 31. Pentamminechloroplatinum (IV) chloride ionises to give A) Two ions. B) Five ions. C) Four ions. D) Three ions. Show Answer Correct Answer: C) Four ions. 32. What is the trend in atomic radius from left to right across a period? A) Atomic radius remains the same. B) Atomic radius decreases. C) Atomic radius increases. D) None of the above. Show Answer Correct Answer: B) Atomic radius decreases. 33. Which of the following is an example of a complex compound? A) K2SO4.Al2(SO4)3.24H2O. B) CoCl3(NH3)6. C) KCl.MgCl2.6H2O. D) FeSO4.(NH4)2SO4.6H2O. Show Answer Correct Answer: B) CoCl3(NH3)6. 34. What is the correct IUPAC name for [Cu(NH$_{3}$)$_{4}$]SO$_{4}$? A) Tetraamminecopper(II) sulfate. B) Tetraamminesulfatecopper(II). C) Tetraamminesulfatecopper(I). D) Tetraamminecopper(I) sulfate. Show Answer Correct Answer: A) Tetraamminecopper(II) sulfate. 35. EAN of Ni in Ni(CO)4? A) 36. B) 28. C) 18. D) 10. Show Answer Correct Answer: A) 36. 36. Which of the following species has the electron configuration [Ar]3d$^{4}$? A) Cr$^{2+}$. B) Ti. C) Fe$^{2+}$. D) V$^{2+}$. Show Answer Correct Answer: A) Cr$^{2+}$. 37. Which of the following is NOT a type of stereoisomerism in coordination compounds? A) Geometrical isomerism. B) Optical isomerism. C) Linkage isomerism. D) None of the above. Show Answer Correct Answer: C) Linkage isomerism. 38. Which form of isomerism is known as 'hydrate isomerism' in coordination compounds? A) Geometrical isomerism. B) Solvate isomerism. C) Linkage isomerism. D) Optical isomerism. Show Answer Correct Answer: B) Solvate isomerism. 39. What is optical isomerism and how does it apply to coordination compounds? A) Optical isomerism involves the formation of ionic bonds in coordination compounds. B) Optical isomerism is the ability of compounds to conduct electricity. C) Optical isomerism refers to the color change in coordination compounds. D) Optical isomerism is the existence of non-superimposable mirror images (enantiomers) in coordination compounds, affecting their optical activity. Show Answer Correct Answer: D) Optical isomerism is the existence of non-superimposable mirror images (enantiomers) in coordination compounds, affecting their optical activity. 40. The number of of geometrical isomers shown by the square planar complex[Mabcd] is A) 3. B) 2. C) O. D) 1. Show Answer Correct Answer: A) 3. 41. Which of the following is a chelating ligand? A) Ammonia (NH3). B) Ethylenediamine (en). C) Water (H2O). D) Chloride (Cl-). Show Answer Correct Answer: B) Ethylenediamine (en). 42. The charge of ammonia is ..... A) 0. B) 1-. C) 1+. D) 2+. Show Answer Correct Answer: A) 0. 43. CN-is a strong field ligand. This is due to the fact that A) It carries negative charge. B) It is a pseudohalide. C) It can accept electrons from metal species. D) It forms high spin complexes with metal species. Show Answer Correct Answer: B) It is a pseudohalide. 44. Outer Orbital complexes having ..... hybridization A) D2Sp3. B) Sp3d2. C) Dsp2. D) Sp3. Show Answer Correct Answer: B) Sp3d2. 45. What determines the geometry of a coordination compound? A) Oxidation state. B) Primary valencies. C) Secondary valency. D) Ligand size. Show Answer Correct Answer: C) Secondary valency. 46. The IUPAC name of compound Na$_{3}$ [Co(ONO)$_{6}$] A) Sodium hexanitrocobaltate (III). B) Sodium hexanitrito-O-cobaltate (III). C) Sodium cobalt nitrite. D) Hexanitritocobalt (III) sodium. Show Answer Correct Answer: B) Sodium hexanitrito-O-cobaltate (III). 47. Which of the following is an example of ionisation isomerism? A) [Co(NH3)6][Cr(CN)6]. B) [Co(NH3)5(SO4)]Br and [Co(NH3)5Br]SO4. C) [Cr(NH3)6][Co(CN)6]. D) [Co(NH3)5(NO2)]Cl2. Show Answer Correct Answer: B) [Co(NH3)5(SO4)]Br and [Co(NH3)5Br]SO4. 48. Dichloridobis(ethane-1, 2-diamine)cobalt(III) ion is A) [CoCl$_{2}$ (en)$_{3}$ ]$^{+}$. B) [CuCl$_{2}$ (en)$_{2}$ ]$^{+}$. C) [CoCl$_{3}$ (en)$_{2}$ ]$^{+}$. D) [CoCl$_{2}$ (en)$_{2}$ ]$^{+}$. Show Answer Correct Answer: D) [CoCl$_{2}$ (en)$_{2}$ ]$^{+}$. 49. Compound having same molecular formula but gives different ions in solution is called A) Coordination isomerism. B) Linkage Isomerism. C) Ionisation isomerism. D) Hydrate isomerism. Show Answer Correct Answer: C) Ionisation isomerism. 50. Which ligand is represented by the symbol 'NO2' in coordination compounds? A) Nitro. B) Nitrate. C) Nitrite. D) Nitronium. Show Answer Correct Answer: A) Nitro. 51. A molecule that cannot be superimposed on its mirror image is said to exhibit which of the following? A) Linkage isomerism. B) Optical isomerism. C) Geometrical isomerism. D) Coordination isomerism. Show Answer Correct Answer: B) Optical isomerism. 52. Amongst the following, the most stable complex is A) [Fe(H2O)6]3+. B) [Fe(C2O4)3]3-. C) [FeCl6]3-. D) [Fe(NH3)6]3+. Show Answer Correct Answer: B) [Fe(C2O4)3]3-. 53. What is the name of the compound K3[Co(C2O4)3]? A) Potassium trioxalatoaluminate(III). B) Potassium tetrahydroxozincate(II). C) Potassium hexacyanocobaltate(III). D) Potassium tetraamminehydroxocobaltate(III). Show Answer Correct Answer: A) Potassium trioxalatoaluminate(III). 54. If the complex ion is a cation, how is the metal named? A) By its elemental name. B) With the suffix-ium. C) By its oxidation state. D) With the suffix-ate. Show Answer Correct Answer: A) By its elemental name. 55. Which term describes a ligand that can bind through two donor atoms simultaneously to a single metal ion? A) Bidentate. B) Ambidentate. C) Monodentate. D) Chelate. Show Answer Correct Answer: A) Bidentate. 56. In the coordination compound, K$_{4}$[Ni(CN)$_{4}$], the oxidation state of nickel is A) -1. B) +2. C) 0. D) +1. Show Answer Correct Answer: C) 0. 57. Which of the following is an example of a double salt? A) Potassium ferrocyanide. B) KCl. C) NaCl. D) Mohr Salt. Show Answer Correct Answer: D) Mohr Salt. 58. What is the IUPAC name for [PtCl2(NH3)2]? A) Chloroplatinum(IV). B) Dichloroplatinum(II). C) Diamminedichloroplatinum(II). D) Tetraammineplatinum(II). Show Answer Correct Answer: C) Diamminedichloroplatinum(II). 59. Select the correct IUPAC name for [Cr(H2O)4Cl2]Cl. A) Tetraquadichloro chromium(III) chloride. B) Tetraquadichlorochromate(III). C) Chromium tetraaqua dichloro chloride. D) Dichlorotetraaquachromium(III) chloride. Show Answer Correct Answer: A) Tetraquadichloro chromium(III) chloride. 60. What is the term for the two forms of optical isomers that rotate the plane of polarised light in opposite directions? A) Facial and Meridional. B) Dextro and Laevo. C) Chiral and Non-chiral. D) Cis and Trans. Show Answer Correct Answer: B) Dextro and Laevo. 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