Chapter Exam

Unit 6: d & f Block Elements and Coordination Compounds — Online MCQ Test

Q: Which of the following is a characteristic property of transition elements?

Answer: A. They form colored ions and compounds — Transition elements often show variable oxidation states and form colored ions due to d-d transitions.

Q: The most common oxidation state of lanthanides is:

Answer: C. +3 — Lanthanides most commonly show the +3 oxidation state because they lose two 6s and one 5d/4f electron.

Q: Which among the following has the highest oxidation state commonly observed in transition metals?

Answer: A. Mn — Manganese shows very high oxidation states, up to +7 in compounds like KMnO4.

Q: In the complex [Fe(CN)6]4-, the oxidation state of Fe and the hybridization are respectively:

Answer: A. +2 and d2sp3 — Each CN- is -1, so Fe is +2. CN- is a strong-field ligand and forms a low-spin octahedral complex with d2sp3 hybridization.

CHEMISTRY · CLASS 12 INTERMEDIATE 2 YEAR · Telangana State Board

Practice Unit 6: d & f Block Elements and Coordination Compounds with a free chapter-wise online MCQ test for Telangana State Board CLASS 12 INTERMEDIATE 2 YEAR CHEMISTRY. This chapter covers: This chapter details transition elements lanthanides actinides coordination theories Werner theory IUPAC nomenclature isomerism bonding in complexes and metal carbonyls.. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Unit 6: d & f Block Elements and Coordination Compounds — Important Questions & Answers (FAQ)

Frequently asked questions from Telangana State Board CLASS 12 INTERMEDIATE 2 YEAR CHEMISTRY — Unit 6: d & f Block Elements and Coordination Compounds, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which of the following is a characteristic property of transition elements?

A. They form colored ions and compounds ✓
B. They have only +1 oxidation state
C. They never form complexes
D. They are all non-metals

Answer: A. They form colored ions and compounds
Transition elements often show variable oxidation states and form colored ions due to d-d transitions.

The most common oxidation state of lanthanides is:

A. +1
B. +2
C. +3 ✓
D. +4

Answer: C. +3
Lanthanides most commonly show the +3 oxidation state because they lose two 6s and one 5d/4f electron.

Which statement best explains why transition metals often act as catalysts?

A. They have fixed oxidation states only
B. They can show variable oxidation states and form intermediates ✓
C. They are always highly volatile
D. They do not form complexes

Answer: B. They can show variable oxidation states and form intermediates
Variable oxidation states and complex formation help transition metals form intermediate compounds during catalysis.

Which among the following has the highest oxidation state commonly observed in transition metals?

A. Mn ✓
B. Fe
C. Co
D. Ni

Answer: A. Mn
Manganese shows very high oxidation states, up to +7 in compounds like KMnO4.

In the complex [Fe(CN)6]4-, the oxidation state of Fe and the hybridization are respectively:

A. +2 and d2sp3 ✓
B. +3 and sp3d2
C. +2 and sp3d2
D. +3 and d2sp3

Answer: A. +2 and d2sp3
Each CN- is -1, so Fe is +2. CN- is a strong-field ligand and forms a low-spin octahedral complex with d2sp3 hybridization.

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