Transition Elements and Coordination Chemistry Basics - Advanced Concepts
Q. In the context of redox reactions, what does the term 'oxidation state' refer to?
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A.
The charge of an atom in a molecule
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B.
The number of bonds an atom can form
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C.
The energy level of electrons
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D.
The size of an atom
Solution
The oxidation state refers to the charge of an atom in a molecule, indicating its degree of oxidation.
Correct Answer: A — The charge of an atom in a molecule
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Q. In which oxidation state does manganese exhibit the highest oxidation state?
Solution
Manganese exhibits the highest oxidation state of +7 in permanganate ion (MnO4-).
Correct Answer: D — +7
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Q. What is the coordination number of the complex ion [Co(NH3)6]Cl3?
Solution
The coordination number is 6 because there are six ammonia ligands coordinated to the cobalt ion.
Correct Answer: C — 6
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Q. What is the primary oxidation state of chromium in Cr2O7^2-?
Solution
In Cr2O7^2-, chromium is in the +6 oxidation state.
Correct Answer: C — +6
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Q. What is the primary reason for the formation of coordination complexes?
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A.
Ionic bonding
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B.
Covalent bonding
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C.
Metal-ligand interactions
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D.
Hydrogen bonding
Solution
Coordination complexes form primarily due to metal-ligand interactions, which can involve coordinate covalent bonds.
Correct Answer: C — Metal-ligand interactions
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Q. What is the primary role of ligands in coordination compounds?
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A.
To increase solubility
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B.
To stabilize the metal ion
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C.
To provide color
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D.
To act as a reducing agent
Solution
Ligands stabilize the metal ion by forming coordinate covalent bonds.
Correct Answer: B — To stabilize the metal ion
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Q. What type of isomerism is exhibited by the complex [Co(NH3)4Cl2]+?
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A.
Geometric
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B.
Optical
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C.
Linkage
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D.
Coordination
Solution
Geometric isomerism is exhibited due to the different arrangements of ligands around the metal center.
Correct Answer: A — Geometric
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Q. Which of the following metals is most likely to undergo reduction in a redox reaction?
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A.
Aluminum
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B.
Gold
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C.
Iron
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D.
Zinc
Solution
Gold is less reactive and more likely to be reduced compared to the other metals listed.
Correct Answer: B — Gold
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