Heavy water is a form of water in which the hydrogen atoms are replaced by deuterium, an isotope of hydrogen that has one neutron in addition to the proton (unlike standard hydrogen, protium, which has only a proton). Its chemical formula is D₂O or ²H₂O.
Heavy water (Nuclear science)
Asked in UPPSC Upper Mains 2007 · Topic: Hydrogen and Its Compounds (Heavy Water (D2O): Preparation, properties, and uses)
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Answer: B. contains deuterium in place of hydrogen
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