1. Which of the following terms is used for the ion or molecule bound directly to the metal atom?
Answer:
Explanation:
Ligands are ions or molecules that can donate pairs of electrons to the central metal atom or ion in a coordination compound.
2. Which of the following ligands can form a ring with the central metal atom?
Answer:
Explanation:
Ethylenediamine can form chelate rings with metal ions due to its bidentate nature.
3. How many coordination bonds are there in [Fe(CN)6]3−?
Answer:
Explanation:
There are six cyanide ligands attached to the Fe ion, each forming one coordination bond.
4. What is the coordination number of Ni in [Ni(CO)4]?
Answer:
Explanation:
There are four CO ligands attached to Ni, giving it a coordination number of 4.
5. Which of the following is a bidentate ligand?
Answer:
Explanation:
The oxalate ion has two oxygen atoms that can bind to a central metal, making it a bidentate ligand.
6. What type of isomerism is exhibited by [Co(NH3)4Cl2]+ and [Co(NH3)2Cl4]2−?
Answer:
Explanation:
The two compounds give different ions in solution, demonstrating ionization isomerism.
7. The splitting of d-orbitals in an octahedral field is due to:
Answer:
Explanation:
The splitting of d-orbitals is influenced by the ligands, the geometry of the complex, and the charge on the metal ion.
8. Which of the following ligands is considered a strong field ligand?
Answer:
Explanation:
Cyanide (CN−) is a strong field ligand and causes a large splitting of d-orbitals.
9. What is the oxidation number of Cr in [Cr(H2O)6]3+?
Answer:
Explanation:
The oxidation number of Cr in [Cr(H2O)6]3+ is +3.
10. The coordination compounds having the same molecular formula but different properties are known as:
Answer:
Explanation:
Isomers are compounds with the same molecular formula but different structures or spatial arrangements, resulting in different properties.
11. A ligand that can ligate through two different atoms is known as:
Answer:
Explanation:
Ambidentate ligands can attach to the central metal atom through two different atoms.
12. Which compound will show optical isomerism?
Answer:
Explanation:
[Co(NH3)4Cl2]+ can exist in two non-superimposable mirror image forms, hence it shows optical isomerism.
13. The color in coordination compounds arises due to:
Answer:
Explanation:
The color in coordination compounds can arise due to d-d transitions, charge transfer transitions, and ligand to metal charge transfers.
14. Which of the following ligands acts as a bridge between two metal centers?
Answer:
Explanation:
μ-OH acts as a bridging ligand between two metal centers.
15. What type of hybridization is exhibited by [Ni(CO)4]?
Answer:
Explanation:
[Ni(CO)4] undergoes sp3 hybridization.
16. [Mn(H2O)6]3+ is colored, while [Sc(H2O)6]3+ is colorless. This is because:
Answer:
Explanation:
Sc3+ has no unpaired electrons and doesn't undergo d-d transitions, whereas Mn3+ does, leading to the observed colors.
17. In Werner's theory, the number of ions produced by a coordination compound in an aqueous solution is termed as:
Answer:
Explanation:
Werner introduced the idea of the ionization number, indicating the number of ions a compound would produce in solution.
18. Which ligand can cause a greater splitting of d-orbitals in an octahedral field?
Answer:
Explanation:
Ammonia (NH3) is a stronger field ligand compared to the others listed and can cause greater d-orbital splitting.
19. The formula of a coordination compound is [Pt(NH3)2Cl4]. The pair of ions produced by this compound when dissolved in water is:
Answer:
Explanation:
The compound produces [Pt(NH3)2Cl2]2+ and two chloride ions in solution.
20. Which of the following is a chelating ligand?
Answer:
Explanation:
Ethylenediamine can form rings with metal ions due to its ability to bind at two sites, making it a chelating ligand.