Chemistry: Lanthanide Contraction and Transition Metal Reactions
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Chemistry: Lanthanide Contraction and Transition Metal Reactions

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Questions and Answers

Why is Cu+ not stable in aqueous solution?

  • It has a high negative ∆hydHθ value (correct)
  • Due to the presence of unpaired electrons
  • Due to high reduction potential
  • It can easily compensate for 2nd ionization potential of Cu

    • Why do oxygen and fluoride oxidize metals to their highest oxidation state in oxides or fluorides?

  • Their small size and high electronegativity make them efficient oxidizing agents (correct)
  • Because they have high positive reduction potential
  • They possess unpaired electrons in their valence shell
  • Due to their large size and low electronegativity

    • Why are the electronic configurations of lanthanoids uncertain?

  • +ve electrons cannot jump between 4f and 5d levels
  • 4f/5d subshells have significantly different energies (correct)
  • Lanthanoids have unstable electronic configurations
  • Lanthanoids do not follow the aufbau principle

    • Why are Zn, Cd, and Hg soft with low melting points?

    <p>Weak interatomic attraction/absence of unpaired electrons</p> Signup and view all the answers

    What effect does pH have on a solution of K2Cr2O4?

    <p>Solution changes into K2Cr2O7</p> Signup and view all the answers

    Why do transition metals like V have high nuclear charge?

    <p>To facilitate the acceptance of lone pair of electrons</p> Signup and view all the answers

    What is the role of vacant d-orbitals in transition metals?

    <p>Accommodate the lone pair of electrons</p> Signup and view all the answers

    Why are transition metals like V colored in compounds like V2O5?

    <p>Due to defects in crystal</p> Signup and view all the answers

    What characteristic makes transition metals useful as catalysts?

    <p>Ability to adopt multiple oxidation states</p> Signup and view all the answers

    What property of interstitial compounds of transition metals contributes to their high melting points?

    <p>Small size of non-metals fitting into voids</p> Signup and view all the answers

    Why do transition metals provide larger surface area for reactants in catalysis?

    <p>Two outermost shells being incomplete</p> Signup and view all the answers

    What allows transition metals to form homogeneous mixtures in alloys?

    <p>Having approximate same size</p> Signup and view all the answers

    Which property of transition metals like V allows them to retain metallic conductivity in interstitial compounds?

    <p>Small size fit for interstitial voids</p> Signup and view all the answers

    Why do transition metals retain their metallic conductivity in interstitial compounds?

    <p>Their ability to adopt multiple oxidation states</p> Signup and view all the answers

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