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d- and f-Block Elements — NEET Chemistry Practice

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The d- and f-Block Elements Revision Guide for NEET Chemistry

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

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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

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What to practise in The d- and f-Block Elements

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Top 20 The d- and f-Block Elements MCQs with Answers

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NEET Chemistry · The d- and f-Block Elements · Very Hard

1. A transition element is one that has:

  • A. Only s electrons
  • B. Only p electrons
  • C. A partially filled d subshell in its atom or a common oxidation state
  • D. A completely filled d subshell in all states
Answer: C
Explanation: Transition elements possess an incomplete d subshell in the atom or in at least one common ion.

NEET Chemistry · The d- and f-Block Elements · Very Hard

2. Which element of the first transition series is not considered a transition element?

  • A. V
  • B. Zn
  • C. Sc
  • D. Ti
Answer: B
Explanation: Zn and Zn2+ have completely filled 3d10 configurations and therefore do not meet the usual definition.

NEET Chemistry · The d- and f-Block Elements · Very Hard

3. The general electronic configuration of d-block elements is:

  • A. (n−1)d1–10 ns0–2
  • B. ns2np1–6
  • C. (n−2)f1–14(n−1)d0–1ns2
  • D. ns1
Answer: A
Explanation: d-block elements involve progressive filling of the (n−1)d orbitals.

NEET Chemistry · The d- and f-Block Elements · Very Hard

4. The electronic configuration of Cr is:

  • A. [Ar] 3d4 4s2
  • B. [Ar] 3d6
  • C. [Ar] 3d3 4s3
  • D. [Ar] 3d5 4s1
Answer: D
Explanation: Chromium adopts a half-filled 3d5 configuration with one 4s electron due to extra stability.

NEET Chemistry · The d- and f-Block Elements · Very Hard

5. The electronic configuration of Cu is:

  • A. [Ar] 3d8 4s3
  • B. [Ar] 3d10 4s2
  • C. [Ar] 3d10 4s1
  • D. [Ar] 3d9 4s2
Answer: C
Explanation: Copper adopts the stable completely filled 3d10 configuration with one 4s electron.

NEET Chemistry · The d- and f-Block Elements · Very Hard

6. Transition metals show variable oxidation states because:

  • A. They are all nonmetals
  • B. The ns and (n−1)d orbitals have comparable energies
  • C. Only s electrons participate in bonding
  • D. d orbitals are absent
Answer: B
Explanation: Both ns and (n−1)d electrons can participate in bonding, producing multiple oxidation states.

NEET Chemistry · The d- and f-Block Elements · Very Hard

7. The highest oxidation state in the first transition series is shown by:

  • A. Mn
  • B. Fe
  • C. Co
  • D. Ni
Answer: A
Explanation: Manganese attains +7 in permanganate because it has seven valence electrons available.

NEET Chemistry · The d- and f-Block Elements · Very Hard

8. The most common oxidation state of scandium is:

  • A. +2
  • B. +1
  • C. +4
  • D. +3
Answer: D
Explanation: Sc loses its two 4s electrons and one 3d electron to form the stable d0 Sc3+ ion.

NEET Chemistry · The d- and f-Block Elements · Very Hard

9. The most stable oxidation state of zinc is:

  • A. +3
  • B. +4
  • C. +2
  • D. +1
Answer: C
Explanation: Zn2+ has a stable 3d10 configuration.

NEET Chemistry · The d- and f-Block Elements · Very Hard

10. Transition-metal ions are often coloured because of:

  • A. Complete absence of unpaired electrons
  • B. d–d electronic transitions
  • C. s–s transitions only
  • D. Nuclear transitions
Answer: B
Explanation: Partially filled d orbitals split in a ligand field, enabling absorption in the visible region.

NEET Chemistry · The d- and f-Block Elements · Very Hard

11. Which ion is colourless in aqueous solution?

  • A. Sc3+
  • B. Ti3+
  • C. V3+
  • D. Cr3+
Answer: A
Explanation: Sc3+ is d0 and cannot undergo d–d transitions.

NEET Chemistry · The d- and f-Block Elements · Very Hard

12. Which ion is generally colourless because of a d10 configuration?

  • A. Cu2+
  • B. Ni2+
  • C. Co2+
  • D. Zn2+
Answer: D
Explanation: Zn2+ has a filled d10 subshell and no d–d transitions.

NEET Chemistry · The d- and f-Block Elements · Very Hard

13. Paramagnetism in transition-metal ions arises from:

  • A. Nuclear spin only
  • B. Filled p orbitals
  • C. Unpaired d electrons
  • D. Paired s electrons
Answer: C
Explanation: Unpaired electrons produce a net magnetic moment.

NEET Chemistry · The d- and f-Block Elements · Very Hard

14. The spin-only magnetic moment is given by:

  • A. μ = n2 BM
  • B. μ = √[n(n+2)] BM
  • C. μ = n(n+1) BM
  • D. μ = √n BM
Answer: B
Explanation: For n unpaired electrons, the spin-only magnetic moment is √[n(n+2)] Bohr magnetons.

NEET Chemistry · The d- and f-Block Elements · Very Hard

15. An ion with three unpaired electrons has spin-only magnetic moment closest to:

  • A. 3.87 BM
  • B. 1.73 BM
  • C. 2.83 BM
  • D. 5.92 BM
Answer: A
Explanation: μ = √[3(3+2)] = √15 ≈ 3.87 BM.

NEET Chemistry · The d- and f-Block Elements · Very Hard

16. Transition metals form alloys readily because:

  • A. They are all gases
  • B. They have identical oxidation states only
  • C. Their atoms are extremely different in size
  • D. Their atomic radii are similar
Answer: D
Explanation: Similar atomic sizes allow substitution in metallic lattices.

NEET Chemistry · The d- and f-Block Elements · Very Hard

17. Transition metals form interstitial compounds because:

  • A. The metals have no crystal lattice
  • B. Only ionic bonding occurs
  • C. Small atoms such as H, B, C or N occupy lattice holes
  • D. Large anions replace metal atoms completely
Answer: C
Explanation: Small atoms fit into interstitial sites of the metal lattice.

NEET Chemistry · The d- and f-Block Elements · Very Hard

18. Interstitial compounds are often:

  • A. Electrical insulators only
  • B. Hard and high-melting while retaining metallic conductivity
  • C. Soft gases
  • D. Low-melting molecular solids
Answer: B
Explanation: Strong lattice interactions increase hardness and melting point, while metallic bonding preserves conductivity.

NEET Chemistry · The d- and f-Block Elements · Very Hard

19. Transition metals are good catalysts mainly because of:

  • A. Variable oxidation states and adsorption ability
  • B. Absence of d electrons
  • C. Very low surface area
  • D. Complete chemical inertness
Answer: A
Explanation: They can adsorb reactants and form intermediate oxidation states, lowering activation barriers.

NEET Chemistry · The d- and f-Block Elements · Very Hard

20. The catalytic activity of Fe in the Haber process is enhanced by:

  • A. Catalyst poisons
  • B. Removing surface area
  • C. Adding only noble gases
  • D. Promoters such as Mo
Answer: D
Explanation: Molybdenum improves the activity and durability of iron catalyst.

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