IUPAC nomenclature isomerism bonding approaches crystal field ideas colour and magnetic properties and importance in qualitative analysis and biological systems - One Line Questions

1. The crystal field stabilization energy (CFSE) for a d1 ion in an octahedral field is: — -0.4 Δo
2. Which of the following complexes exhibits optical isomerism? — [Co(en)3]3+
3. Which of the following is an example of ionization isomerism? — [Co(NH3)5SO4]Br and [Co(NH3)5Br]SO4
4. Which of the following complexes is likely to be colorless? — [Zn(H2O)6]2+
5. What is the oxidation state of Cobalt in K3[Co(CN)6]? — +3
6. In the complex [Co(NH3)4(H2O)Cl]2+, what is the oxidation state of Cobalt? — +3
7. The electronic configuration of a central metal ion in a complex is d4. In an octahedral field, if it is a low spin complex, how many unpaired electrons are there? — 1
8. A complex with a magnetic moment of approximately 5.92 BM indicates the presence of how many unpaired electrons? — 5
9. What is the coordination number of the central metal ion in [PtCl2(NH3)2]? — 4
10. The color of [Cu(H2O)6]2+ is blue. This is due to absorption of light in the orange-red region of the spectrum, causing a d-d transition of which electron? — 3d9 to 3d8
11. Linkage isomerism arises due to the presence of: — Ambidentate ligands
12. The color observed is complementary to the color of light absorbed. If a complex absorbs green light, it will appear: — Red
13. Which of the following is an example of a complex used in chemotherapy? — Cisplatin
14. In Werner's theory, primary valency corresponds to: — Oxidation state of the metal ion
15. In crystal field theory, what does Δo represent? — Splitting energy in octahedral complexes
16. The color of a coordination compound is due to: — Both a and b
17. The presence of unpaired electrons in a complex is responsible for its: — Paramagnetism
18. What is the IUPAC name of [Ag(NH3)2]Cl? — Diamminesilver(I) chloride
19. The spectrochemical series ranks ligands based on their ability to: — Cause crystal field splitting
20. Which of the following is a monodentate ligand? — Chloride
21. According to Crystal Field Theory (CFT), the splitting of d-orbitals in an octahedral complex is into two sets of orbitals with energies t2g and eg. Which set has lower energy? — t2g
22. In a tetrahedral field, the d-orbitals split into two sets, eg and t2g. Which set is lower in energy? — t2g
23. Which of the following is NOT a property explained by Werner's theory? — The color of complexes
24. Which isomerism arises when a ligand can coordinate through two different atoms? — Linkage isomerism
25. Which of the following is a bidentate ligand? — en (ethylenediamine)
26. What is the IUPAC name of the complex [Co(NH3)6]Cl3? — Hexamminecobalt(III) chloride
27. In a square planar complex with configuration d8 and strong field ligands, the complex is usually: — Low spin and diamagnetic
28. Which of the following is a strong field ligand? — CN-
29. In the complex [PtCl2(NH3)2], what type of isomerism is exhibited? — Geometric isomerism
30. Which type of isomerism is exhibited by [Co(NH3)5(SCN)]Cl2 and [Co(NH3)5(NCS)]Cl2? — Linkage isomerism
31. Which metal ion is central to Vitamin B12? — Cobalt
32. Chlorophyll, a pigment in plants, contains which metal ion? — Magnesium
33. Which type of isomerism is shown by [Co(NH3)5Br]SO4? — Ionization isomerism
34. A complex with a large Δo value will absorb light of: — Shorter wavelength
35. Which of the following ions is responsible for oxygen transport in blood? — Fe2+
36. The ligand that donates two donor atoms to the central metal ion is called: — Bidentate ligand
37. The chelate effect is most pronounced for: — Polydentate ligands
38. The magnetic moment of [Fe(CN)6]4- is 0 BM. This indicates that the complex is: — Diamagnetic with no unpaired electrons
39. What is the IUPAC name of [Fe(CO)5]? — Pentacarbonyliron(0)
40. Which phenomenon explains the color of transition metal complexes? — d-d transitions
41. What is the IUPAC name of Na2[CoCl4]? — Sodium tetrachlorocobaltate(II)
42. Coordination isomerism occurs when: — The cation and anion parts of different complexes exchange ligands
43. A complex with d5 configuration in an octahedral field can be high spin or low spin depending on: — All of the above
44. Hydrate isomerism occurs when: — Water molecules are present as counter ions and coordinated ligands
45. The complex [Co(en)2(NO2)2]+ can exist as isomers. The isomer where the two NO2 groups are adjacent is called: — Cis isomer
46. What is the IUPAC name for [Cr(en)3]Cl3? — Tris(ethylenediamine)chromium(III) chloride
47. High spin complexes are favored when: — Δo < P (pairing energy)
48. The splitting energy in an octahedral field is denoted by: — Δo
49. The magnetic moment of a complex is related to the number of unpaired electrons by which equation? — μ = √n(n+2) BM
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