d and f Block Elements CBSE Class 12 MCQ & Practice Questions

Practice d and f Block Elements MCQs for CBSE Class 12 Chemistry with answers, explanations, chapter revision and related ChemNexa mock tests.

d and f Block Elements Revision Guide for CBSE Class 12 Chemistry

d and f Block Elements is part of CBSE Class 12 Chemistry preparation. A strong revision plan should combine concept review with exam-style questions so that definitions, relationships, calculations and exceptions are recalled accurately.

Use the sample MCQs on this page to check understanding, then attempt the related ChemNexa tests for broader practice. When an answer is wrong, review the explanation and return to the underlying concept before attempting another set.

Important Topics

Core definitions and principles
Important equations or relationships
Common applications and examples
Frequently confused concepts
Exam-style multiple-choice questions
Error review and targeted revision

Revision Tip

Create a one-page summary of trends, structures, reactions, exceptions and key terminology for d and f Block Elements, then test recall with mixed MCQs.

What to practise in d and f Block Elements

Concept Revision

Revise definitions, principles, equations, trends and core ideas from d and f Block Elements before attempting MCQs.

Exam-style MCQs

Use chapter-focused multiple-choice practice to improve accuracy, recall and application for CBSE Class 12 Chemistry.

Performance Practice

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Top 6 d and f Block Elements MCQs with Answers

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CBSE Class 12 Chemistry · d and f Block Elements · Easy

1. Transition elements have partially filled:

A. s orbitals only
B. d orbitals in atoms or common ions
C. p orbitals only
D. f orbitals only

Answer: B

Explanation: This is the defining electronic feature.

CBSE Class 12 Chemistry · d and f Block Elements · Medium

2. Lanthanoid contraction is caused mainly by:

A. Good shielding by 4f electrons
B. Poor shielding by 4f electrons
C. Increase in principal shell
D. Loss of all f electrons

Answer: B

Explanation: Effective nuclear charge increases across the series.

CBSE Class 12 Chemistry · d and f Block Elements · Medium

3. Which element shows the highest oxidation state in the first transition series?

A. Sc
B. Ti
C. Mn
D. Zn

Answer: C

Explanation: Manganese reaches +7.

CBSE Class 12 Chemistry · d and f Block Elements · Medium

4. Many transition-metal ions are coloured due to:

A. s–s transitions
B. d–d transitions
C. nuclear transitions
D. proton transfer

Answer: B

Explanation: Visible light can promote electrons between split d levels.

CBSE Class 12 Chemistry · d and f Block Elements · Hard

5. A species with all electrons paired is:

A. Paramagnetic
B. Diamagnetic
C. Ferromagnetic only
D. Antiferromagnetic only

Answer: B

Explanation: Paired electrons produce no permanent magnetic moment.

CBSE Class 12 Chemistry · d and f Block Elements · Medium

6. Assertion (A): Separation of lanthanoids is difficult. Reason (R): Their ionic radii and chemical properties are very similar.

A. Both A and R are true, and R explains A
B. Both A and R are true, but R does not explain A
C. A is true, but R is false
D. A is false, but R is true

Answer: A

Explanation: Lanthanoid contraction produces only small changes across the series.

d and f Block Elements Practice Tests