Transition Elements and Coordination Chemistry Basics - Case Studies
Q. In redox reactions, what happens to the oxidation state of a transition metal when it acts as an oxidizing agent?
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A.
It decreases
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B.
It increases
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C.
It remains the same
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D.
It becomes zero
Solution
When a transition metal acts as an oxidizing agent, its oxidation state increases as it gains electrons.
Correct Answer: B — It increases
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Q. In redox reactions, which species is reduced?
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A.
Oxidizing agent
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B.
Reducing agent
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C.
Product
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D.
Reactant
Solution
The oxidizing agent is reduced as it gains electrons during the reaction.
Correct Answer: A — Oxidizing agent
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Q. What is the coordination number of the complex ion [Co(NH3)6]3+?
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 coordination number of the complex ion [Ni(CN)4]2-?
Solution
The coordination number of [Ni(CN)4]2- is 4, as it has four cyanide ligands coordinated to the nickel ion.
Correct Answer: B — 4
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Q. What is the oxidation state of chromium in the complex ion [Cr(NH3)6]Cl3?
Solution
In the complex [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 oxidation state of chromium in the complex [Cr(NH3)4Cl2]+?
Solution
The oxidation state of chromium is +3, calculated from the charges of the ligands.
Correct Answer: B — +3
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Q. Which of the following is a characteristic of coordination compounds?
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A.
They contain only ionic bonds.
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B.
They have a central metal atom bonded to ligands.
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C.
They cannot conduct electricity.
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D.
They are always soluble in water.
Solution
Coordination compounds consist of a central metal atom bonded to one or more ligands.
Correct Answer: B — They have a central metal atom bonded to ligands.
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Q. Which of the following metals is most commonly used in metallurgy for extraction via reduction?
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A.
Aluminum
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B.
Iron
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C.
Copper
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D.
Zinc
Solution
Iron is commonly extracted from its ore using reduction methods in metallurgy.
Correct Answer: B — Iron
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Q. Which of the following transition metals is most commonly used in metallurgy for its catalytic properties?
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A.
Copper
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B.
Iron
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C.
Nickel
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D.
Platinum
Solution
Platinum is widely used in metallurgy for its excellent catalytic properties.
Correct Answer: D — Platinum
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