Class 12 Chemistry — Chapter 4: The d- and f-Block Elements
96 practice questions · 32 Easy · 32 Medium · 32 Hard
Practise Class 12 Chemistry Chapter 4, "The d- and f-Block Elements", with 96 NCERT-aligned multiple-choice questions. The set is split into 32 Easy, 32 Medium and 32 Hard questions, so you can warm up on the fundamentals and then push into the exam-level problems that separate top scorers in CBSE Board exams, JEE Main, JEE Advanced and NEET UG.
"The d- and f-Block Elements" is one of the chapters where reactions, named concepts, and balanced numerical work really pays off. Each MCQ on this chapter is timed and uses exam-grade marking (+2 correct, −1 wrong, 0 skipped), training the same accuracy-under-pressure that real papers demand. Every question carries a short explanation, so a wrong answer becomes a quick lesson rather than a dead end — the fastest way to close gaps before a test.
Use this chapter as targeted revision: attempt the Easy set first to confirm your basics on The d- and f-Block Elements, then move to Medium and Hard to test application and problem-solving. Your accuracy, streaks and XP save automatically, and the chapter feeds into your overall Class 12 Chemistry mastery score. A few sample questions are shown below; sign in free to practise all 96.
Key concepts: The d- and f-Block Elements (Class 12 Chemistry)
This chapter covers the transition (d-block) and inner-transition (f-block) elements — their electronic configurations, characteristic properties, and important compounds.
- d-block elements
- Transition metals with partly filled d-orbitals; show variable oxidation states, coloured ions, catalytic activity and form complexes.
- Variable oxidation states
- Arise because the (n−1)d and ns electrons have similar energies and can both participate in bonding.
- Coloured ions & magnetism
- Colour is due to d–d electronic transitions; many ions are paramagnetic due to unpaired d-electrons (spin-only formula).
- Lanthanoid contraction
- A steady decrease in size across the lanthanoids due to poor shielding by 4f electrons; affects the properties of later d-block elements.
- Important compounds
- Potassium dichromate (K₂Cr₂O₇) and potassium permanganate (KMnO₄) are strong oxidising agents with well-known preparations.
Key formulas — The d- and f-Block Elements
💡 Exam tips for The d- and f-Block Elements
- Use μ = √[n(n+2)] to estimate the number of unpaired electrons from the magnetic moment.
- Lanthanoid contraction explains why 4d and 5d elements of a group have nearly the same size.
Sample questions
d-block elements have last electron in:
Penultimate shell d-orbital.
Transition metals show:
Close energies of (n−1)d and ns electrons.
Why are many transition metals good catalysts?
Provide alternative reaction pathways.
The d- and f-Block Elements — FAQs
What are the key concepts in Class 12 Chemistry The d- and f-Block Elements?+
This chapter covers the transition (d-block) and inner-transition (f-block) elements — their electronic configurations, characteristic properties, and important compounds. Key ideas include d-block elements, Variable oxidation states, Coloured ions & magnetism, Lanthanoid contraction, Important compounds.
What does Class 12 Chemistry Chapter 4 (The d- and f-Block Elements) cover on XamBaaz?+
It covers 96 NCERT-aligned MCQs on "The d- and f-Block Elements" — 32 Easy, 32 Medium and 32 Hard — each with a timed quiz and an instant explanation, suitable for CBSE Board exams, JEE Main, JEE Advanced and NEET UG.
Are these "The d- and f-Block Elements" questions free to practise?+
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How should I revise "The d- and f-Block Elements" for the exam?+
Start with the Easy quiz to confirm your fundamentals, then attempt Medium and Hard for application-level practice. Review each explanation, retry the questions you miss, and track your accuracy on this chapter until it is consistently high.
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