Which of the following statements about heavy water is incorrect?

  1. It may be used as a moderator of neutrons.
  2. It is a radioactive substance.
  3. It is not safe to drink.
  4. It is also called deuterium oxide.

Answer (Detailed Solution Below)

Option 2 : It is a radioactive substance.
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Detailed Solution

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  • Heavy water is not radioactive.
  • Hence, option 2 is incorrect.
  • Heavy Water:-
    • Deuterium oxide, D2O.
    • It is an oxide of the isotope of hydrogen, Deuterium.
    • It is a colourless and odourless liquid.
    • A molecule of heavy water has two deuterium atoms in place of the two normal hydrogen atoms of ordinary "light" water.
    • The presence of deuterium gives the water different nuclear properties, and the increase of mass gives it slightly different physical and chemical properties when compared to normal water.
    • Heavy water is not radioactive.
    • Heavy water is not safe to drink. 
    • American scientist and Nobel laureate Harold Urey discovered the isotope deuterium in 1931.
    • Argentina is the main producer of heavy water.
    • Heavy water is used in certain types of nuclear reactors, where it acts as a neutron moderator to slow down neutrons so that they are more likely to react with the fissile uranium-235 than with uranium-238. ​
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