Crystal Field Theory and Octahedral Complexes
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Questions and Answers

In crystal field theory, why are metal ions attracted to the electron pairs in ligands?

  • Lone pair of electrons in ligands repel the metal ions
  • Overlap between metal orbitals and ligand orbitals (correct)
  • Repulsion between metal orbitals and ligand orbitals
  • Absence of overlap between metal orbitals and ligand orbitals
  • What happens to the energy levels of the 3d orbitals in an octahedral complex compared to an isolated atom?

  • They remain the same
  • They split into two sets (correct)
  • They degenerate
  • They decrease uniformly
  • What is the consequence of having a strong ligand field in terms of spin configurations?

  • Low spin with Δo > P
  • High spin with Δo < P
  • Low spin with Δo < P
  • High spin with Δo > P (correct)
  • What is the Jahn-Teller Effect related to in transition metal complexes?

    <p>Unequal occupancy of degenerate orbitals</p> Signup and view all the answers

    In an octahedral complex, how are the higher energy set of orbitals labeled based on symmetry?

    <p>$e_g$</p> Signup and view all the answers

    True or False: In a low spin configuration, Δo is smaller than the pairing energy P.

    <p><em>False</em></p> Signup and view all the answers

    Which theory explains the behavior of metal ions in crystals?

    <p>Ligand field theory</p> Signup and view all the answers

    In an octahedral complex, how many anionic ligands are present?

    <p>6</p> Signup and view all the answers

    Which method is NOT commonly used to detect the formation of a coordination compound?

    <p>Catalysis</p> Signup and view all the answers

    What type of orbitals are used in the Valence bond approach to explain differences in magnetic behavior?

    <p>d and f orbitals</p> Signup and view all the answers

    Which of the following is associated with the Jahn-Teller Effect?

    <p>Octahedral distortion</p> Signup and view all the answers

    What property is NOT considered when detecting the formation of a coordination compound?

    <p>Molecular weight</p> Signup and view all the answers

    In a coordination compound involving a complex ion of square planar geometry, which type of isomerism is never possible?

    <p>Optical</p> Signup and view all the answers

    What is the general formula for octahedral complexes that exhibit mer – fac isomerism?

    <p>MA4B2</p> Signup and view all the answers

    What happens when light bounces off an object and all light is reflected?

    <p>The object appears white</p> Signup and view all the answers

    Why do different ligands on the same metal give different colors in complexes?

    <p>Because of crystal field splitting</p> Signup and view all the answers

    What happens when light is absorbed by an object and none is reflected?

    <p>The object appears black</p> Signup and view all the answers

    Why does the addition of NH3 ligand to Cu(H2O)4 change its color?

    <p>Because of crystal field theory effects</p> Signup and view all the answers

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