Discussion
Heavy water is:
Answer: A
Heavy water is deuterium oxide, D2O, in which both hydrogen atoms are the heavier isotope with a proton and a neutron.
It occurs naturally as about one part in 6,400 of ordinary water and is about 11 per cent denser. Because it absorbs very few neutrons it is used as a moderator in nuclear reactors, including India's PHWRs.
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