🧪 JEE Main Chemistry — d- and f-Block Elements

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📄 PYQs

Previous year questions for d- and f-Block Elements with detailed solutions

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📝 Mock Test

Chapter mock test for d- and f-Block Elements based on latest NTA pattern

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📚 Notes

Concise notes with all important formulas and concepts for d- and f-Block Elements

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🔥 Top Repeated Questions

Most frequently asked d- and f-Block Elements questions across all JEE Main sessions

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d- and f-Block Elements — Overview for JEE Main

d- and f-Block Elements is an important chapter in JEE Main Chemistry. Every mark matters for your JEE Main rank.

This page provides PYQs with solutions, chapter mock tests, concise formula notes, and the most frequently repeated questions from d- and f-Block Elements across all JEE Main sessions.

Key Topics in d- and f-Block Elements

Properties of transition metals
Variable oxidation states
Catalytic properties
Lanthanide contraction
Colours of transition metal ions

How to Prepare d- and f-Block Elements for JEE Main

Step 1 — NCERT First: Read the NCERT chapter completely. Understand every concept and formula derivation before moving to reference books.

Step 2 — Practice Book: For Physical Chemistry chapters, solve numericals from Narendra Awasthi or OP Tandon. For Organic, study mechanisms from MS Chauhan. For Inorganic, NCERT reading with JD Lee supplementation is sufficient.

Step 3 — PYQ Practice: Use the PYQ link above to practice all previous year questions for d- and f-Block Elements. Identify the most common question types and master them.

Step 4 — Timed Mock Test: Take the mock test above under exam conditions. Target under 2 minutes per question. Analyse every mistake immediately.

Frequently Asked Questions

Why do transition metals show variable oxidation states? +

Transition metals have incompletely filled d subshells. Both (n-1)d and ns electrons can participate in bonding. The energy difference between (n-1)d and ns orbitals is small, making multiple oxidation states feasible. Example: Mn shows +2, +3, +4, +6, +7. The most stable oxidation state usually corresponds to the most stable half-filled or completely filled d configuration. JEE Main tests which oxidation states are most/least stable for given metals.

What is lanthanide contraction and its consequences? +

Lanthanide contraction: across the lanthanide series (La to Lu), atomic and ionic radii decrease steadily due to poor shielding of f electrons. Consequences: (1) Zr and Hf have almost identical radii and are hard to separate, (2) 5d transition metals have similar sizes to 4d metals, (3) Lanthanides and actinides in same group have similar chemistry. JEE Main tests lanthanide contraction consequences.

Why are transition metal compounds coloured? +

Colour arises from d-d electronic transitions. When white light falls on a transition metal compound, photons of specific energy are absorbed to promote electrons from lower to higher d orbitals (crystal field splitting). The transmitted/reflected colour is complementary to absorbed colour. Compounds with d⁰ (Sc³⁺) or d¹⁰ (Zn²⁺) configurations are colourless — no d-d transitions possible. JEE Main tests colours of common transition metal ions and compounds.

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