Inorganic Chemistry - d & f Block Elements
Q. What is the common oxidation state of chromium in CrO3? (2023)
Solution
In CrO3, chromium (Cr) has an oxidation state of +6.
Correct Answer: C — +6
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Q. What is the primary oxidation state of iron in FeCl3? (2023)
Solution
In FeCl3, iron (Fe) has a primary oxidation state of +3.
Correct Answer: B — +3
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Q. Which of the following elements is known for its ability to form complex ions? (2022)
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A.
Copper
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B.
Calcium
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C.
Sodium
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D.
Barium
Solution
Copper (Cu) is known for its ability to form complex ions due to its d-orbitals.
Correct Answer: A — Copper
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Q. Which of the following f-block elements is used in making strong permanent magnets? (2022)
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A.
Cerium
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B.
Neodymium
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C.
Plutonium
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D.
Uranium
Solution
Neodymium is used in making strong permanent magnets, known as neodymium magnets.
Correct Answer: B — Neodymium
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Q. Which of the following is a property of actinides? (2020)
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A.
All are radioactive
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B.
All are non-metals
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C.
All are stable
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D.
All are found in nature
Solution
All actinides are radioactive, with many being synthetic and unstable.
Correct Answer: A — All are radioactive
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