30 Questions
What is the term used for the type of volumetric analysis involving the formation of complexes?
Complexometric titration
In a complex formation, what does the symbol (L) represent?
Ligand
What role does the ligand play in a complex formation?
Electron donor
What is the maximum number of ligands that can be introduced in a complex formation?
Co-ordination number
What type of bond involves one component atom providing the electron pair to form the bond?
Dative bond
In a dative bond, what is the atom called that donates the electron pair?
Donor
What is the definition of coordination number in a complex?
The number of ligands held about the central metal atom
Which of the following is true about coordination numbers in complexes?
They are typically even numbers
What is a characteristic of unidentate (monodentate) ligands?
They form one coordinate bond or donate one unshared pair of electrons
In a complex with neutral ligands like NH3, what is the relationship between the charge of the complex and the central metal atom?
The charges are the same
What is a requirement for a ligand to form a dative bond with a central metal atom?
Having a lone pair of electrons or unshared pair of electrons
How do coordination numbers relate to the charge of the central metal ion?
They are usually double the charge of the metal
What is a requirement for ligands in titrimetric analysis?
Having at least two acidic groups
Which type of group is considered a coordinating group for ligands?
Phenolic Ether (-O-)
How does the size of the central metal ion affect the stability of a complex?
Smaller ions result in more stable complexes
Which metal ion is generally more likely to form stable complexes based on electronegativity?
Iron (Fe)
In terms of stability, how does the basicity of a ligand influence a complex?
Higher basicity increases complex stability
Which type of ligand has higher basicity compared to Iodide (I-) and Bromide (Br-)?
Oxygen (O)
What is a polydentate ligand?
A ligand that attaches to the metal ion at more than one site
Why are polydentate ligands more stable than monodentate ligands?
Because they have more than one point of attachment to the metal
What defines a bidentate ligand?
It is a ligand attached to the metal ion at two sites
What is chelation in coordination chemistry?
The process of complexation using ligands with multiple donor groups
What distinguishes tetradentate ligands?
They are attached to the metal ion at four sites
Why are chelates usually insoluble in water but soluble in organic solvents?
Because they form ring structures with metals
Why do multidentate ligands form more stable complexes than monodentate ligands?
They have a greater number of attachment points to the metal ion.
Why do large, bulky ligands form less stable complexes than smaller ones?
Steric hindrance reduces stability.
In terms of chelate ring size, which type of ligands form stable complexes?
Saturated ligands forming 5-membered rings
What is the most powerful chelating agent discussed in the text?
Ethylene diamine tetracetic acid
How many donor atoms does EDTA, a hexadentate ligand, contain?
2 nitrogen and 4 oxygen donors
Why is EDTA not selective for certain cations like group VI and alkali group metals?
It is a hexadentate ligand.
Test your knowledge on polydentate ligands and their classification. Learn about bidentate ligands, multidentate ligands, and their advantages over monodentate ligands in complex formation.
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