Heavy water, used as moderator in nuclear reactors, has the formula:
AH$_2$O, the normal water of the kitchen tap
BH$_2$O$_2$, the disinfectant on the chemist shelf
CD$_2$O, where D is deuterium ($^2$H) atoms throughout
DT$_2$O, where T is the radioactive tritium isotope
Answer & Solution
Correct answer: C. D$_2$O, where D is deuterium ($^2$H) atoms throughout
Heavy water = D$_2$O (deuterium oxide).
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