Q. What is the coordination number of a metal in a complex with six ligands?
A.
2
B.
4
C.
6
D.
8
Solution
The coordination number is defined as the number of ligand donor atoms that are bonded to the central metal atom. In this case, with six ligands, the coordination number is 6.
Q. What is the oxidation state of cobalt in the complex [Co(NH3)6]Cl3?
A.
+2
B.
+3
C.
+4
D.
0
Solution
In the complex [Co(NH3)6]Cl3, the ammonia (NH3) is a neutral ligand, and the overall charge of the complex is +3 due to the three chloride ions, indicating that cobalt is in the +3 oxidation state.
Q. What is the primary factor that determines the color of coordination compounds?
A.
The size of the metal ion
B.
The type of ligands
C.
The oxidation state of the metal
D.
The geometry of the complex
Solution
The color of coordination compounds is primarily determined by the type of ligands, which affect the d-orbital splitting and the wavelengths of light absorbed.
Q. Which of the following statements about chelation is true?
A.
It involves only monodentate ligands.
B.
It increases the stability of metal complexes.
C.
It decreases solubility in water.
D.
It is irrelevant in biological systems.
Solution
Chelation involves bidentate or polydentate ligands and increases the stability of metal complexes due to the formation of multiple bonds with the metal.
Correct Answer:
B
— It increases the stability of metal complexes.
