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JEE Main d- and f-Block Elements — practice questions

Explore 13 free d- and f-Block Elements questions in JEE Main Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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d- and f-Block Elements questions and exercises with answers

Showing questions 1–13 of 13.

d-block elements have differentiating electrons in:Read the answer and worked solution →f-block elements include:Read the answer and worked solution →Compounds of transition metals are usually:Read the answer and worked solution →Why does Zn²⁺ have no color (Zn = d¹⁰)?Read the answer and worked solution →Which transition metal forms unstable highest oxidation state +7?Read the answer and worked solution →Magnetic moment of complex with 5 unpaired d-electrons (high spin):Read the answer and worked solution →K₂Cr₂O₇ (potassium dichromate) is a strong:Read the answer and worked solution →Coordination number of Ag in [Ag(CN)₂]⁻:Read the answer and worked solution →Magnetic moment of [Fe(H₂O)₆]³⁺ (Fe³⁺ is d⁵, weak field H₂O → high spin):Read the answer and worked solution →Number of unpaired electrons in [Mn(CN)₆]³⁻ (Mn(III), d⁴, strong field CN⁻):Read the answer and worked solution →Eu²⁺ is more stable than other Ln²⁺ because:Read the answer and worked solution →Why is Sc³⁺ colorless?Read the answer and worked solution →Magnetic susceptibility of Fe³⁺ vs Fe²⁺ in high-spin complexes:Read the answer and worked solution →

Worked practice questions

d-block elements have differentiating electrons in:

  1. p-orbital
  2. d-orbital (groups 3-12)
  3. s-orbital
  4. f-orbital
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Correct answer: B. d-orbital (groups 3-12)

d-block: groups 3-12. d-electron is the differentiating one. Includes Sc, Ti, V, Cr, Mn, Fe, ..., Cu, Zn, etc. Transition metals (technically d¹-d⁹, so Sc-Cu).

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f-block elements include:

  1. Noble gases
  2. Lanthanides (4f¹⁻¹⁴) and Actinides (5f¹⁻¹⁴)
  3. Halogens
  4. Sc, Y
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Correct answer: B. Lanthanides (4f¹⁻¹⁴) and Actinides (5f¹⁻¹⁴)

f-block: Inner transition elements. **Lanthanides (La/Ce-Lu):** 4f filling. **Actinides (Ac/Th-Lr):** 5f filling. Generally placed at bottom of periodic table for compactness.

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Compounds of transition metals are usually:

  1. Colorless
  2. Always white
  3. Often COLORED (due to d-d electronic transitions)
  4. Black
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Correct answer: C. Often COLORED (due to d-d electronic transitions)

d-d transitions absorb visible light → complementary color visible. **Exceptions:** d⁰ (colorless, e.g., Sc³⁺, Ti⁴⁺) and d¹⁰ (colorless, e.g., Cu⁺, Zn²⁺) ions have no d-d transitions.

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More Chemistry topics

Aldehydes, Ketones and Carboxylic AcidsElectrochemistryStructure of AtomThe d- and f-Block Elements & Coordination CompoundsSolutionsRedox ReactionsUnit 2B1: Transition Metals & Coordination CompoundsChemical Kinetics