This quiz works best with JavaScript enabled. Home > Class 12 > 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 (25 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) Linkage. B) Coordination. C) Ionisation. D) Hydrate. Show Answer Correct Answer: D) Hydrate. 4. [FeF6]3-Has ..... Hybridization A) Sp3d2. B) D2sp3. C) Sp3. D) Dsp2. Show Answer Correct Answer: A) Sp3d2. 5. What is the formula for the pentaamminehydroxoiron(II) ion? A) [Fe(NH$_{3}$)(OH)$_{5}$]$^{3-}$. B) [Fe(NH$_{3}$)$_{5}$(OH)$_{5}$]$^{2+}$. C) [Fe(NH$_{3}$)$_{5}$(OH)]$^{2+}$. D) [Fe(NH$_{3}$)$_{5}$(OH)$_{5}$]$^{3-}$. E) [Fe(NH$_{3}$)$_{5}$(OH)]$^{+}$. Show Answer Correct Answer: E) [Fe(NH$_{3}$)$_{5}$(OH)]$^{+}$. 6. Which complex obeys EAN rule? A) Ni(CO)4. B) CuSO4. C) FeSO4. D) ZnCl2. Show Answer Correct Answer: A) Ni(CO)4. 7. Which of the following is an example of a coordination compound used in medicine? A) H2O. B) NaCl. C) EDTA. D) C6H12O6. Show Answer Correct Answer: C) EDTA. 8. Which of the following is the correct IUPAC name for [Co(NH3)6]Cl3? A) Hexaamminecobalt(III) chloride. B) Hexaamminechromium(III) chloride. C) Hexaammineiron(III) chloride. D) Hexaammineplatinum(IV) chloride. Show Answer Correct Answer: A) 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 provide electrons to the metal. B) To increase the temperature of the solution. C) To decrease the solubility of the compound. D) To change the color of the solution. Show Answer Correct Answer: A) To provide electrons to the metal. 12. The negative ligand is A) Aqua. B) Sulphato. C) Carboxyl. D) Nitrosonium. Show Answer Correct Answer: B) Sulphato. 13. What is the importance of stereoisomerism in coordination compounds? A) Affects color. B) Influences biological activity. C) Determines solubility. D) Changes coordination number. Show Answer Correct Answer: B) 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) 4. B) 5. C) 6. D) 7. E) 8. Show Answer Correct Answer: C) 6. 15. Hemoglobin contains a heme ligand. How many nitrogen atoms in the heme interact with the central iron atom? A) One. B) Two. C) Three. D) Four. Show Answer Correct Answer: D) 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) Chelation. D) Isomerism. Show Answer Correct Answer: D) Isomerism. 17. The charge of the oxalate ion is ..... A) 2+. B) 3+. C) 1-. D) 2-. Show Answer Correct Answer: D) 2-. 18. State the charge of the bromide ligand A) +1. B) -1. C) +2. D) -2. Show Answer Correct Answer: B) -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) Cu (copper). B) Fe (iron). C) Co (cobalt). D) Zn (zinc). 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) Diamminechloridonitrito-N-platinum(II). B) Potassium trioxalatochromate(III). C) Dichloridobis(ethane-1, 2-diamine)cobalt(III) chloride. D) Pentaamminecarbonatocobalt(III) chloride. Show Answer Correct Answer: A) 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) 7. B) 6. C) 5. D) 4. Show Answer Correct Answer: D) 4. 25. Which of the following does not obey EAN rule? A) [Cu(CN)4]-3. B) Ni(CO)4. C) [Fe(CN)6]-3. D) [Pt(NH3)3Cl3]+. Show Answer Correct Answer: C) [Fe(CN)6]-3. 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