Coordination Compounds - Werner Theory
Q. According to Werner's theory, what is the coordination number of a complex with six ligands?
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Solution
The coordination number is defined as the number of ligands surrounding the central metal atom. In this case, it is 6.
Correct Answer: C — 6
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Q. According to Werner's theory, what type of isomerism is primarily observed in coordination compounds?
A.
Geometric isomerism
B.
Optical isomerism
C.
Structural isomerism
D.
All of the above
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Solution
Werner's theory accounts for various types of isomerism, including geometric, optical, and structural isomerism in coordination compounds.
Correct Answer: D — All of the above
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Q. In a coordination compound, what does the term 'coordination number' refer to?
A.
The number of ligands attached to the metal ion
B.
The total number of electrons in the complex
C.
The oxidation state of the metal ion
D.
The number of unpaired electrons in the metal
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Solution
The coordination number refers to the number of ligands that are directly bonded to the central metal ion in a coordination complex.
Correct Answer: A — The number of ligands attached to the metal ion
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Q. In Werner's theory, what does the term 'primary valence' refer to?
A.
The oxidation state of the metal
B.
The number of ligands
C.
The type of ligands
D.
The geometry of the complex
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Solution
Primary valence refers to the oxidation state of the central metal atom in a coordination compound.
Correct Answer: A — The oxidation state of the metal
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Q. In Werner's theory, what is the role of ligands in coordination compounds?
A.
To provide electrons to the metal ion
B.
To stabilize the oxidation state of the metal
C.
To determine the color of the complex
D.
To increase the coordination number
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Solution
Ligands act as electron donors to the metal ion, forming coordinate covalent bonds and stabilizing the coordination complex.
Correct Answer: A — To provide electrons to the metal ion
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Q. What is the primary concept of Werner's theory of coordination compounds?
A.
The presence of ligands around a central metal ion
B.
The formation of ionic bonds in coordination complexes
C.
The role of oxidation states in coordination chemistry
D.
The geometric arrangement of ligands in a complex
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Solution
Werner's theory emphasizes the importance of ligands surrounding a central metal ion, which defines the structure and properties of coordination compounds.
Correct Answer: A — The presence of ligands around a central metal ion
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Q. What is the significance of the 'secondary valence' in Werner's theory?
A.
It determines the oxidation state
B.
It indicates the number of ligands
C.
It describes the spatial arrangement of ligands
D.
It is irrelevant to coordination chemistry
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Solution
Secondary valence refers to the spatial arrangement of ligands around the central metal atom.
Correct Answer: C — It describes the spatial arrangement of ligands
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Q. What is the significance of the oxidation state of the central metal ion in coordination compounds?
A.
It determines the color of the compound
B.
It affects the coordination number
C.
It influences the stability and reactivity of the complex
D.
It has no significance
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Solution
The oxidation state of the central metal ion is crucial as it influences the stability, reactivity, and overall properties of the coordination complex.
Correct Answer: C — It influences the stability and reactivity of the complex
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Q. What type of complex is formed when a metal ion is surrounded by four ligands in a square planar arrangement?
A.
Tetrahedral complex
B.
Octahedral complex
C.
Square planar complex
D.
Linear complex
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Solution
A square planar complex is formed when a metal ion is surrounded by four ligands arranged in a square plane.
Correct Answer: C — Square planar complex
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Q. What type of geometry is typically associated with a coordination number of 6?
A.
Tetrahedral
B.
Square planar
C.
Octahedral
D.
Linear
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Solution
A coordination number of 6 typically results in an octahedral geometry, which is common in many coordination complexes.
Correct Answer: C — Octahedral
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Q. What type of isomerism is commonly observed in coordination compounds according to Werner's theory?
A.
Structural isomerism
B.
Geometric isomerism
C.
Optical isomerism
D.
All of the above
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Solution
Coordination compounds can exhibit structural, geometric, and optical isomerism, making all types relevant.
Correct Answer: D — All of the above
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Q. Which of the following coordination compounds is an example of a square planar complex?
A.
[Cu(NH3)4]2+
B.
[Ni(CN)4]2-
C.
[Co(H2O)6]3+
D.
[FeCl4]-
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Solution
[Ni(CN)4]2- is a square planar complex, while the others exhibit different geometries.
Correct Answer: B — [Ni(CN)4]2-
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Q. Which of the following coordination numbers is NOT possible according to Werner's theory?
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Solution
Coordination numbers typically range from 2 to 6 in most coordination compounds, making 7 an unlikely coordination number.
Correct Answer: D — 7
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Q. Which of the following is a characteristic of Werner complexes?
A.
They can only form octahedral geometries
B.
They exhibit isomerism
C.
They are always neutral
D.
They contain only anionic ligands
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Solution
Werner complexes can exhibit isomerism due to different arrangements of ligands around the central metal atom.
Correct Answer: B — They exhibit isomerism
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Q. Which of the following is NOT a characteristic of Werner's theory?
A.
It describes the bonding in coordination compounds
B.
It predicts the existence of isomers
C.
It is based solely on empirical observations
D.
It categorizes ligands as primary and secondary
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Solution
Werner's theory is not solely based on empirical observations; it provides a theoretical framework for understanding coordination compounds.
Correct Answer: C — It is based solely on empirical observations
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Q. Which of the following ligands is considered a bidentate ligand according to Werner's theory?
A.
NH3
B.
EDTA
C.
Cl-
D.
H2O
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Solution
EDTA is a bidentate ligand because it can form two bonds with a metal ion, while NH3, Cl-, and H2O are monodentate ligands.
Correct Answer: B — EDTA
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Q. Which of the following ligands would be classified as a bidentate ligand according to Werner's theory?
A.
NH3
B.
EDTA
C.
Cl-
D.
H2O
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Solution
EDTA is a bidentate ligand because it can form two bonds with a metal ion.
Correct Answer: B — EDTA
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Q. Which of the following statements is true regarding Werner's theory?
A.
It only applies to transition metals
B.
It does not consider the geometry of complexes
C.
It explains the formation of coordination compounds
D.
It is outdated and not used in modern chemistry
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Solution
Werner's theory is significant as it explains the formation and structure of coordination compounds, making it a foundational concept in coordination chemistry.
Correct Answer: C — It explains the formation of coordination compounds
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