Coordination compounds Werner's theory ligands coordination number and isomerism - Question Bank

1. Consider the complex [Co(en)2(NO2)2]+. This complex can exhibit geometrical isomerism. The cis isomer of this complex is chiral and exhibits:
A) Optical isomerism
B) Linkage isomerism
C) Coordination isomerism
D) Ionization isomerism
2. Which of the following statements about ligands is INCORRECT?
A) Ligands are Lewis bases.
B) Ligands can be neutral molecules or ions.
C) Ligands can only bind to the central metal ion through one atom.
D) The denticity of a ligand refers to the number of donor atoms.
3. In the complex [Pt(NH3)2Cl2], which arrangement of ligands leads to 'cis' isomer?
A) NH3 and Cl- ligands are opposite to each other
B) Both NH3 ligands are adjacent to each other
C) Both Cl- ligands are adjacent to each other
D) One NH3 and one Cl- are adjacent
4. Which of the following is NOT a type of structural isomerism in coordination compounds?
A) Ionization isomerism
B) Hydration isomerism
C) Optical isomerism
D) Linkage isomerism
5. The term 'coordination number' was introduced by whom in the context of coordination compounds?
A) Alfred Werner
B) Dmitri Mendeleev
C) Linus Pauling
D) Gilbert N. Lewis
6. Werner's theory successfully explained the properties of coordination compounds by proposing:
A) The octet rule
B) Primary and secondary valencies
C) Hybridization
D) Crystal field splitting
7. A mixture of equal amounts of two enantiomers is called a:
A) Chiral mixture
B) Racemic mixture
C) Meso compound
D) Diastereomeric mixture
8. The complex [Co(en)2Cl2]+ exhibits which type of isomerism?
A) Only geometrical isomerism
B) Only optical isomerism
C) Both geometrical and optical isomerism
D) Neither geometrical nor optical isomerism
9. Which type of complex is likely to exhibit optical isomerism?
A) [Ma4]
B) [Ma2b2] (square planar)
C) [Ma2b4] (octahedral)
D) [M(en)3]3+
10. A coordination compound that is non-superimposable on its mirror image is called:
A) Achiral
B) Chiral
C) Racemic
D) Meso
11. Optical isomerism occurs when a coordination compound is:
A) Superimposable on its mirror image
B) Non-superimposable on its mirror image
C) Planar
D) Linear
12. In an octahedral complex [Ma4b2], the trans isomer has the two 'b' ligands in:
A) Adjacent positions (90° apart)
B) Opposite positions (180° apart)
C) Equatorial positions
D) Axial positions
13. In an octahedral complex [Ma4b2], the cis isomer has the two 'b' ligands in:
A) Adjacent positions (90° apart)
B) Opposite positions (180° apart)
C) Equatorial positions
D) Axial positions
14. Which type of geometrical isomerism is possible for an octahedral complex of the type [Ma4b2]?
A) cis and trans
B) Facial and Meridional
C) E and Z
D) Syn and Anti
15. In a square planar complex [Ma2b2], the trans isomer has the two 'a' ligands in:
A) Adjacent positions
B) Opposite positions
C) Equatorial positions
D) Axial positions
16. In a square planar complex [Ma2b2], the cis isomer has the two 'a' ligands in:
A) Adjacent positions
B) Opposite positions
C) Diagonal positions
D) Equatorial positions
17. Which type of geometrical isomerism is possible for a square planar complex of the type [Ma2b2]?
A) Facial and Meridional
B) cis and trans
C) E and Z
D) None of the above
18. Geometrical isomerism in coordination compounds arises due to different:
A) Connectivity of atoms
B) Spatial arrangement of ligands
C) Nature of counter ions
D) Charge of the complex
19. Stereoisomerism in coordination compounds includes which of the following types?
A) Geometrical and Optical isomerism
B) Linkage and Ionization isomerism
C) Coordination and Hydration isomerism
D) Structural and Ionization isomerism
20. The complexes [Co(NH3)4Br2]Cl and [Co(NH3)4BrCl]Br exhibit which type of isomerism?
A) Linkage isomerism
B) Coordination isomerism
C) Ionization isomerism
D) Hydration isomerism
21. Ionization isomerism occurs when the difference between isomers is in the nature of the ion:
A) Inside the coordination sphere only
B) Outside the coordination sphere only
C) Both inside and outside the coordination sphere
D) Only in the counter ions
22. The complex [Co(NH3)5(NO2)]Cl2 and [Co(NH3)5(ONO)]Cl2 exhibit which type of isomerism?
A) Coordination isomerism
B) Linkage isomerism
C) Ionization isomerism
D) Hydration isomerism
23. Which of the following is an ambidentate ligand?
A) Ammonia (NH3)
B) Ethylenediamine (en)
C) Nitrite ion (NO2-)
D) Water (H2O)
24. In linkage isomerism, the ligand that can coordinate through more than one donor atom is called:
A) Bidentate ligand
B) Chelating ligand
C) Ambidentate ligand
D) Bridging ligand
25. Hydration isomerism is a specific type of isomerism where water molecules are involved as:
A) Ligands only
B) Counter ions only
C) Both ligands and counter ions
D) Solvent molecules
26. Which of the following pairs exhibits coordination isomerism?
A) [Co(NH3)6][Cr(CN)6] and [Cr(NH3)6][Co(CN)6]
B) [Co(en)3][Cr(CN)6] and [Cr(en)3][Co(CN)6]
C) [Co(NH3)4Cl2][Pt(NH3)2Cl2] and [Pt(NH3)4Cl2][Co(NH3)2Cl2]
D) All of the above
27. In coordination isomerism, the difference lies in the composition of:
A) The cation and anion
B) The complex cation and complex anion
C) The ligands only
D) The counter ions only
28. Coordination isomerism is a type of which broader category of isomerism?
A) Stereoisomerism
B) Structural isomerism
C) Optical isomerism
D) Geometrical isomerism
29. Which type of isomerism arises due to differences in the connectivity of atoms or ligands in coordination compounds?
A) Stereoisomerism
B) Structural isomerism
C) Geometrical isomerism
D) Optical isomerism
30. The phenomenon where two or more coordination compounds have the same molecular formula but differ in the arrangement of ligands around the central metal ion is called:
A) Resonance
B) Isomerism
C) Tautomerism
D) Allotropism
31. Which of the following complexes has a coordination number of 4 for the central metal ion?
A) [Co(NH3)6]^3+
B) [Cu(H2O)6]^2+
C) [PtCl2(NH3)2]
D) [Fe(CN)6]^4-
32. In the complex [Ni(en)2Cl2], what is the coordination number of Nickel (Ni)?
A) 2
B) 3
C) 4
D) 6
33. In the complex [Co(NH3)6]^3+, what is the coordination number of Cobalt (Co)?
A) 1
B) 3
C) 6
D) 9
34. The coordination number of a central metal ion is defined as:
A) The total number of ligands attached to the central metal ion.
B) The number of donor atoms from the ligands attached to the central metal ion.
C) The number of coordinate bonds formed by the central metal ion with ligands.
D) The oxidation state of the central metal ion.
35. The number of donor atoms present in a ligand is referred to as its:
A) Oxidation state
B) Coordination number
C) Denticity
D) Charge
36. Which of the following is a bidentate ligand?
A) Ammonia (NH3)
B) Water (H2O)
C) Oxalate ion (C2O4^2-)
D) Cyanide ion (CN-)
37. A ligand that can bind to the central metal atom through two donor atoms is called:
A) Monodentate ligand
B) Bidentate ligand
C) Tridentate ligand
D) Polydentate ligand
38. EDTA (Ethylenediaminetetraacetic acid) is typically a ligand of what denticity?
A) Monodentate
B) Bidentate
C) Hexadentate
D) Octadentate
39. Ethylenediamine (en) is an example of which type of ligand?
A) Monodentate
B) Bidentate
C) Tridentate
D) Tetradentate
40. A ligand that can bind to the central metal atom through only one donor atom is called:
A) Bidentate ligand
B) Tridentate ligand
C) Monodentate ligand
D) Polydentate ligand
41. Which of the following is an example of a monodentate ligand?
A) Ethylenediamine (en)
B) Oxalate (ox^2-)
C) Chloride ion (Cl-)
D) Acetylacetonate (acac-)
42. Ligands are also known as:
A) Lewis acids
B) Lewis bases
C) Brønsted-Lowry acids
D) Brønsted-Lowry bases
43. What are the species that donate electron pairs to the central metal atom/ion called in coordination compounds?
A) Central metal ion
B) Ligands
C) Counter ions
D) Complexing agents
44. Which type of valency is satisfied by coordinate bonds in coordination compounds according to Werner?
A) Primary valency
B) Secondary valency
C) Both primary and secondary valency
D) Neither primary nor secondary valency
45. Which type of valency is satisfied by ionic bonds in coordination compounds according to Werner?
A) Secondary valency
B) Primary valency
C) Both primary and secondary valency
D) Neither primary nor secondary valency
46. Secondary valency in Werner's theory is directional and corresponds to which property?
A) Oxidation State
B) Number of counter ions
C) Coordination Number
D) Charge of the complex
47. Primary valency in Werner's theory corresponds to which property of the central metal ion?
A) Coordination Number
B) Oxidation State
C) Electronegativity
D) Atomic Radius
48. What are the two types of valencies proposed by Werner?
A) Primary and Secondary
B) Ionic and Covalent
C) Sigma and Pi
D) Oxidation and Coordination
49. According to Werner's theory, coordination compounds possess how many types of valencies?
A) One
B) Two
C) Three
D) Four
50. Who proposed the theory to explain the structure and bonding in coordination compounds?
A) Dalton
B) Lavoisier
C) Werner
D) Rutherford
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