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
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
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
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.
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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