Heavy water has the chemical formula D₂O, where D represents Deuterium. Deuterium is an isotope of hydrogen that contains one proton and one neutron in its nucleus (whereas common hydrogen, Protium, has only one proton). Thus, deuterium is a heavier isotope of hydrogen. Heavy water (D₂O) is water composed of two deuterium atoms and one oxygen atom.
Heavy water of an atomic reactor is :
Asked in UPSC CAPF 2015 · Topic: Hydrogen and Its Compounds (Heavy Water (D2O): Preparation, properties, and uses)
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Answer: D. an oxide of heavier isotope of hydrogen
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