Multiple choice

Heavy water is

  1. tritium oxide

  2. deuterium oxide

  3. rain water

  4. water at -4oC
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Heavy water is deuterium oxide (D2O), where hydrogen atoms are replaced by deuterium (hydrogen-2 isotope). It's called 'heavy' because deuterium has twice the mass of regular hydrogen. Tritium oxide would be even heavier, and the other options are unrelated to heavy water.

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