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

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

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

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

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

  • A. Only s electrons
  • B. Only f electrons
  • C. An incomplete d subshell in its atom or common ion
  • D. A completely filled d10 shell in all states
Answer: C
Explanation: Transition elements possess partially filled d orbitals in the atom or a common oxidation state.

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

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

  • A. ns1 only
  • B. (n-1)d1-10 ns0-2
  • C. ns2np1-6
  • D. (n-2)f1-14 ns2
Answer: B
Explanation: The differentiating electron enters the penultimate d subshell.

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

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

  • A. A completely filled d10 configuration
  • B. A d5 configuration
  • C. No d electrons in the atom
  • D. An f14 configuration
Answer: A
Explanation: Zn and Zn2+ do not have an incomplete d subshell.

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

4. Variable oxidation states of transition metals arise because:

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

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

5. The highest common oxidation state of manganese is:

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

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

6. The oxidation state of chromium in Cr2O7^2- is:

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

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

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

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

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

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

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

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

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

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

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

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

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

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

11. Paramagnetism in transition-metal ions is due to:

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

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

12. The spin-only magnetic moment is:

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

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

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

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

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

14. Transition metals readily form complexes because of:

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

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

15. Transition metals are effective catalysts partly because they:

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

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

16. Iron is used as catalyst in the:

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

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

17. V2O5 is used as catalyst in the:

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

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

18. Nickel is commonly used to catalyse:

  • A. Formation of ozone
  • B. Hydrogenation of alkenes and oils
  • C. Nitration of benzene only
  • D. Electrolysis of brine
Answer: B
Explanation: Nickel catalyses addition of hydrogen to unsaturated compounds.

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

19. Interstitial compounds of transition metals are generally:

  • A. Hard and high-melting
  • B. Soft gases
  • C. Highly volatile liquids
  • D. Molecular sugars
Answer: A
Explanation: Small atoms occupy interstitial sites, often increasing hardness.

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

20. Transition metals readily form alloys because they often have:

  • A. Completely different sizes
  • B. No metallic bonding
  • C. Only covalent networks
  • D. Similar atomic radii and crystal structures
Answer: D
Explanation: Comparable sizes permit substitution in metallic lattices.

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