Transition Elements and Coordination Chemistry Basics
Q. In the context of redox reactions, which transition metal is commonly used as a reducing agent?
A.
Manganese
B.
Iron
C.
Copper
D.
Silver
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Solution
Iron is commonly used as a reducing agent in various redox reactions.
Correct Answer: B — Iron
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Q. What is the coordination number of the central metal ion in the complex [Cu(NH3)4]SO4?
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Solution
The coordination number of copper in [Cu(NH3)4]SO4 is 4, as it is surrounded by four ammonia ligands.
Correct Answer: B — 4
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Q. What is the effect of increasing the oxidation state of a transition metal on its ability to act as a Lewis acid?
A.
Increases
B.
Decreases
C.
No effect
D.
Varies unpredictably
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Solution
Increasing the oxidation state of a transition metal generally increases its ability to act as a Lewis acid due to a higher positive charge attracting electron pairs more strongly.
Correct Answer: A — Increases
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Q. What is the oxidation state of chromium in the complex [Cr(NH3)6]Cl3?
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Solution
In [Cr(NH3)6]Cl3, the ammonia ligands are neutral, so the oxidation state of chromium is +3.
Correct Answer: B — +3
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Q. What is the primary reason for the catalytic activity of transition metals?
A.
High atomic mass
B.
Variable oxidation states
C.
Low ionization energy
D.
High electronegativity
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Solution
The variable oxidation states of transition metals allow them to participate in a variety of chemical reactions, making them effective catalysts.
Correct Answer: B — Variable oxidation states
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Q. What type of isomerism is exhibited by the complex [Co(NH3)4Cl2]Cl?
A.
Geometric
B.
Optical
C.
Linkage
D.
Coordination
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Solution
The complex [Co(NH3)4Cl2]Cl exhibits geometric isomerism due to the arrangement of ligands.
Correct Answer: A — Geometric
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Q. Which of the following complexes is an example of a square planar geometry?
A.
[Ni(CN)4]2-
B.
[Co(NH3)6]3+
C.
[Fe(H2O)6]2+
D.
[CuCl4]2-
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Solution
[Ni(CN)4]2- is a square planar complex, while the others typically exhibit octahedral geometry.
Correct Answer: A — [Ni(CN)4]2-
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Q. Which of the following is a characteristic of a coordination compound?
A.
It contains only ionic bonds.
B.
It has a central metal atom bonded to ligands.
C.
It cannot conduct electricity.
D.
It is always a solid.
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Solution
A coordination compound has a central metal atom bonded to one or more ligands.
Correct Answer: B — It has a central metal atom bonded to ligands.
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Q. Which of the following statements about transition metals is true?
A.
They have completely filled d-orbitals.
B.
They can form colored compounds.
C.
They do not form complexes.
D.
They have low melting points.
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Solution
Transition metals can form colored compounds due to d-d electronic transitions.
Correct Answer: B — They can form colored compounds.
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Q. Which of the following transition metals has the highest melting point?
A.
Iron
B.
Tungsten
C.
Nickel
D.
Copper
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Solution
Tungsten has the highest melting point among transition metals, at 3422 °C.
Correct Answer: B — Tungsten
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Q. Which of the following transition metals is known for its ability to form stable complexes with ligands?
A.
Zinc
B.
Copper
C.
Iron
D.
Nickel
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Solution
Nickel is known for its ability to form stable complexes with various ligands.
Correct Answer: D — Nickel
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