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d- and f-Block Elements WBJEE MCQ & Practice Questions

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d- and f-Block Elements Revision Guide for WBJEE Chemistry

d- and f-Block Elements is part of WBJEE 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 equations or relationships
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Top 20 d- and f-Block Elements MCQs with Answers

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WBJEE Chemistry · d- and f-Block Elements · Very Very Hard

1. The differentiating electron in a transition element enters the:

  • A. np subshell
  • B. nf subshell
  • C. (n-1)d subshell
  • D. ns subshell
Answer: C
Explanation: Transition elements involve progressive filling of the penultimate d subshell.

WBJEE Chemistry · d- and f-Block Elements · Very Very Hard

2. A transition element is commonly defined as an element having:

  • A. Only f electrons
  • B. An incomplete d subshell in its atom or common ion
  • C. A completely filled d10 shell in all states
  • D. Only s electrons
Answer: B
Explanation: Partially filled d orbitals are characteristic of transition elements.

WBJEE Chemistry · d- and f-Block Elements · Very 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 ns2
  • D. ns1 only
Answer: A
Explanation: d-block elements fill the penultimate d subshell.

WBJEE Chemistry · d- and f-Block Elements · Very Very Hard

4. Scandium most commonly exhibits oxidation state:

  • A. +2
  • B. +4
  • C. +1
  • D. +3
Answer: D
Explanation: Loss of 4s2 and 3d1 electrons gives stable Sc3+.

WBJEE Chemistry · d- and f-Block Elements · Very Very Hard

5. Zinc is generally not considered a typical transition element because Zn2+ has:

  • A. No d electrons in atom
  • B. An f14 configuration
  • C. A completely filled d10 configuration
  • D. A d5 configuration
Answer: C
Explanation: Zn and Zn2+ lack an incomplete d subshell in the relevant species.

WBJEE Chemistry · d- and f-Block Elements · Very Very Hard

6. Variable oxidation states of transition metals arise because:

  • A. They contain only one valence electron
  • B. ns and (n-1)d electrons have comparable energies
  • C. Only core electrons bond
  • D. Their d orbitals are absent
Answer: B
Explanation: Both ns and d electrons can participate in bonding.

WBJEE Chemistry · d- and f-Block Elements · Very Very Hard

7. The highest common oxidation state of manganese is:

  • A. +7
  • B. +2
  • C. +3
  • D. +5
Answer: A
Explanation: Mn reaches +7 in permanganate.

WBJEE Chemistry · d- and f-Block Elements · Very Very Hard

8. The oxidation state of Cr in Cr2O7^2- is:

  • A. +3
  • B. +2
  • C. +7
  • D. +6
Answer: D
Explanation: 2x + 7(-2) = -2 gives x = +6.

WBJEE Chemistry · d- and f-Block Elements · Very Very Hard

9. The oxidation state of Mn in MnO4- is:

  • A. +2
  • B. +6
  • C. +7
  • D. +4
Answer: C
Explanation: x + 4(-2) = -1 gives x = +7.

WBJEE Chemistry · d- and f-Block Elements · Very Very Hard

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

  • A. Metallic lustre alone
  • B. Electronic transitions involving d orbitals
  • C. Only nuclear transitions
  • D. Absence of electrons
Answer: B
Explanation: Crystal-field splitting permits absorption of visible light through d-d transitions.

WBJEE Chemistry · d- and f-Block Elements · Very Very Hard

11. Sc3+ compounds are generally colourless because Sc3+ is:

  • A. d0
  • B. d5
  • C. d10
  • D. d8
Answer: A
Explanation: No d electrons are available for d-d transitions.

WBJEE Chemistry · d- and f-Block Elements · Very Very Hard

12. Zn2+ compounds are generally colourless because Zn2+ is:

  • A. d5
  • B. d1
  • C. d8
  • D. d10
Answer: D
Explanation: A filled d shell prevents ordinary d-d transitions.

WBJEE Chemistry · d- and f-Block Elements · Very Very Hard

13. Paramagnetism in transition-metal ions arises from:

  • A. Protons
  • B. Neutrons
  • C. Unpaired electrons
  • D. Paired electrons only
Answer: C
Explanation: Unpaired electron spins produce paramagnetism.

WBJEE Chemistry · d- and f-Block Elements · Very Very Hard

14. The spin-only magnetic moment is commonly expressed as:

  • A. sqrt(n) joule
  • B. sqrt[n(n+2)] BM
  • C. n/2 BM
  • D. 2n BM
Answer: B
Explanation: For n unpaired electrons, μ = √[n(n+2)] BM.

WBJEE Chemistry · d- and f-Block Elements · Very Very Hard

15. A d5 high-spin ion has how many unpaired electrons?

  • A. 5
  • B. 1
  • C. 2
  • D. 3
Answer: A
Explanation: Hund's rule gives one electron in each d orbital before pairing.

WBJEE Chemistry · d- and f-Block Elements · Very Very Hard

16. Transition metals readily form complexes mainly because of:

  • A. Very low charge density
  • B. Absence of vacant orbitals
  • C. Only ionic size
  • D. Small highly charged ions and available orbitals
Answer: D
Explanation: Their charge density and orbital availability favour ligand coordination.

WBJEE Chemistry · d- and f-Block Elements · Very Very Hard

17. Transition metals are effective catalysts partly because they:

  • A. Are always inert
  • B. Cannot form intermediates
  • C. Show variable oxidation states and surface adsorption
  • D. Have no valence electrons
Answer: C
Explanation: Variable valency and adsorption facilitate alternative reaction pathways.

WBJEE Chemistry · d- and f-Block Elements · Very Very Hard

18. Finely divided iron acts as catalyst in the:

  • A. Hall process
  • B. Haber process
  • C. Contact process
  • D. Solvay process
Answer: B
Explanation: Iron catalyses ammonia synthesis in the Haber process.

WBJEE Chemistry · d- and f-Block Elements · Very Very Hard

19. V2O5 is used as catalyst in the:

  • A. Contact process
  • B. Haber process
  • C. Solvay process
  • D. Downs process
Answer: A
Explanation: V2O5 catalyses oxidation of SO2 to SO3.

WBJEE Chemistry · d- and f-Block Elements · Very Very Hard

20. Nickel is commonly used to catalyse:

  • A. Nitration of benzene only
  • B. Electrolysis of brine
  • C. Formation of ozone
  • D. Hydrogenation of alkenes/oils
Answer: D
Explanation: Ni surfaces catalyse addition of hydrogen to unsaturated bonds.

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