Hydrogen Nuclear Spin Isomers
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Questions and Answers

What is the key difference between parahydrogen and orthohydrogen?

  • Number of protons
  • Electron arrangement
  • Number of neutrons
  • Nuclear spin direction (correct)

    • What happens to the ratio of para form to ortho form in hydrogen gas when cooled to 20K?

  • 25% para, 75% ortho
  • Stays the same
  • Becomes almost pure parahydrogen (correct)
  • Becomes almost pure orthohydrogen

    • How are the two nuclei in a dihydrogen molecule different?

  • They have different nuclear spin directions (correct)
  • They are antiparallel
  • They are parallel
  • They have different number of protons

    • Which type of nuclear spin does the proton of a hydrogen atom possess?

    <p>+1/2 or -1/2</p> Signup and view all the answers

    What defines isotopes in chemistry?

    <p>Same number of protons and neutrons</p> Signup and view all the answers

    What is the nuclear spin isomer called in dihydrogen where the two nuclei may be parallel or opposed?

    <p>Para-dihydrogen</p> Signup and view all the answers

    Which element is the most abundant in the universe?

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

    At room temperature, dihydrogen is relatively unreactive because:

    <p>It requires large amounts of energy for homolysis of H–H</p> Signup and view all the answers

    Which element does hydrogen NOT form compounds with?

    <p>Noble gases</p> Signup and view all the answers

    What is the percentage of hydrogen in the Earth's crust on an atom basis?

    <p>15.4%</p> Signup and view all the answers

    Which property describes the angular momentum of electrons in a molecule?

    <p>Spin projection</p> Signup and view all the answers

    What is the main factor determining the chemical behaviour of hydrogen isotopes?

    <p>Electronic structure</p> Signup and view all the answers

    Which isotope of hydrogen is radioactive with a half-life of 12 years?

    <p>Tritium T</p> Signup and view all the answers

    In which physical property do deuterium and tritium show a quantitative difference compared to protium?

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

    What is the term for the phenomenon where rats can distinguish between D2O and H2O, preferring the latter?

    <p>Parahydrogen effect</p> Signup and view all the answers

    Which of the following hydrogen isotopes has the highest boiling point?

    <p>$T_{2}$</p> Signup and view all the answers

    What does the difference in mass between hydrogen isotopes mainly lead to?

    <p>Quantitative differences in physical properties</p> Signup and view all the answers

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