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Indian Navy INET d- and f-Block Elements — practice questions

Explore 2 free d- and f-Block Elements questions in Indian Navy INET 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 1–2 of 2.

Why does Zn²⁺ have no color (Zn = d¹⁰)?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 →

Worked practice questions

Why does Zn²⁺ have no color (Zn = d¹⁰)?

  1. No d-d transition possible — d sub-shell full
  2. Reflects all light
  3. Mass
  4. Random
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Correct answer: A. No d-d transition possible — d sub-shell full

Zn²⁺: 3d¹⁰. No empty d orbital to receive a promoted electron. So no d-d transition in visible. Hence Zn²⁺ salts are colorless. Same for Sc³⁺ (d⁰), Cu⁺ (d¹⁰).

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Magnetic moment of [Fe(H₂O)₆]³⁺ (Fe³⁺ is d⁵, weak field H₂O → high spin):

  1. 2.83 BM
  2. 0 BM
  3. 5.92 BM (5 unpaired)
  4. 1.73 BM
Show answer and solution

Correct answer: C. 5.92 BM (5 unpaired)

Fe³⁺: d⁵. H₂O is weak field → high spin: t₂g³ e_g², 5 unpaired electrons. μ = sqrt(35) = 5.92 BM.

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More Chemistry topics

JEE Main 2023 MixedAtomic combinationsStructure of AtomAtoms and ElementsChemical EquilibriumClass9 Atom StructureChemistryAlkenes