25 Questions
What is the ratio of oxygen atoms to another element in sesquioxides?
Three to two
Which lanthanide metals can form LnO2 when heated?
Ce, Pr, and Tb
What is the formula for the common sesquioxides?
Ln2O3
How can the common sesquioxides be made?
By heating lanthanide metals in air or heating oxy-compounds such as nitrate or carbonate
What is the name of the type of oxide compound formed by lanthanide metals?
Sesquioxide
What is the temperature at which Nb3Ge has zero resistivity?
30 K
What is the structural type of Ln2O3 with LnO6 units?
C-type
How are divalent oxides of lanthanides prepared?
By reduction of Ln2O3 with elemental lanthanide
What is the structural feature of A-type Ln2O3?
LnO7 capped-octahedra
Which of the following lanthanides is not mentioned as having a divalent oxide?
Gd
What is the primary factor that determines the coordination geometry of a metal?
The size and shape of the ligands
What is a characteristic of the coordination chemistry of lanthanides Ln3+?
Forming complexes with high coordination numbers
Why does no particular shape or coordination geometry dominate in metal-ligand complexes?
Due to the varying size and shape of the ligands
What type of compounds are LnX3?
Inorganic compounds
What is the primary function of 'self-cleaning' ovens?
To prevent the buildup of tarry deposits
What is the oxidation state of the lanthanides in their coordination chemistry?
Ln3+
What is the reaction required to prepare anhydrous halides LnX3?
Heating the metal and the halogen
Which of the following is a consequence of the varying size and shape of ligands?
No particular shape or coordination geometry being preferred
What is the reason for the high coordination numbers of lanthanide complexes?
Large ionic radii of lanthanides
What is the characteristic of ligands that influences the coordination geometry of a metal?
Their steric demands
What is the relationship between the size and shape of ligands and the coordination geometry of a metal?
The size and shape of the ligands determine the coordination geometry
What type of ligands are commonly found in lanthanide complexes?
A variety of ligands, including monodentate and polydentate
What is the significance of the high coordination numbers of lanthanide complexes?
They can accommodate a variety of ligands
What is the purpose of heating the metal and the halogen in the preparation of anhydrous halides LnX3?
To initiate the reaction between the metal and the halogen
What is the common characteristic of 'self-cleaning' ovens and the preparation of anhydrous halides LnX3?
Both involve heating
Learn about the preparation of sesquioxides, Ln2O3, and oxides LnO2, from lanthanide metals and oxy-compounds. Understand the formation of these compounds through heating processes.
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