NCERT/Class 12/Chemistry/The d- and f-Block Elements

The d- and f-Block Elements

Class 12 · Chemistry

63 questions24 easy22 medium17 hard

Sample Questions

Q1.The magnetic moment of a transition metal ion depends on:

  • ANumber of protons in the nucleus
  • BNumber of unpaired electrons
  • CAtomic mass of the element
  • DElectronegativity

Q2.Which of the following statements about interstitial compounds of transition metals is INCORRECT?

  • AThey have high melting points higher than the parent metal
  • BThey are non-stoichiometric in composition
  • CThey are very hard
  • DThey are highly reactive chemically

Q3.The oxidation state of Mn in MnO₄⁻ (permanganate ion) is:

  • A+4
  • B+5
  • C+6
  • D+7

Q4.The general electronic configuration of outer orbitals of d-block elements is:

  • A(n-1)d¹⁻¹⁰ ns⁰⁻¹
  • B(n-1)d¹⁻¹⁰ ns¹⁻²
  • Cnd¹⁻¹⁰ (n+1)s¹⁻²
  • D(n-2)f¹⁻¹⁴ ns²

Q5.Which of the following transition metal ions would be diamagnetic (no unpaired electrons)?

  • AFe³⁺ (d⁵)
  • BCu²⁺ (d⁹)
  • CZn²⁺ (d¹⁰)
  • DNi²⁺ (d⁸)

Q6.This is a sample question to preview what you'll get in the full practice test...

  • A. Option one
  • B. Option two
  • C. Option three
  • D. Option four
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Concepts Covered

Atomic and ionic radiiCatalytic propertiesColour of transition metal ionsElectronic configuration of transition metalsEnthalpies of atomisationFormation of complex compoundsGeneral properties of transition metalsImportant compounds: K2Cr2O7 and KMnO4Interstitial compounds and alloysLanthanoid contractionLanthanoids and actinoidsMagnetic propertiesOxidation states of transition metalsPosition of d-block and f-block elements

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