Discussion
Heavy water means
Answer: C
Heavy water is water used as a moderator in nuclear reactors. It is deuterium oxide, D2O, in which the hydrogen atoms are the heavy isotope deuterium, and it slows the neutrons in reactors such as the Indian CANDU-type reactors without absorbing them as much as ordinary water. Water treated with chlorine is disinfected water, water that does not form lather with soap is hard water, and distilled water is purified water, so none of these is heavy water.
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